misc: Use go mod

Update package imports to reflect go-mod dependency versions.

Update to etcd/v3. etcd upstream versioning doesn't play well with Go
modules or newer versions of gRPC. v3.5.0 and newer follow Go semantic
versioning guidelines and resolves most versioning conflicts with
co-dependent libraries. There are many issues surrounding this, see [1].

Fix test-examples for Go Modules. Previously this test script symlinked
the examples source directory outside of the mgmt tree, but this doesn't
work with Go modules. Switch to building the example programs in-place,
and simplify the script to reduce the amount of superfluous operations.

Fixes a couple shellcheck warnings in test-examples too.

[1]: etcd-io/etcd#12124

Signed-off-by: Joe Groocock <me@frebib.net>

Makefile

@@ -154,7 +154,7 @@ lang: ## generates the lexer/parser for the language frontend
 
 # build a `mgmt` binary for current host os/arch
 $(PROGRAM): build/mgmt-${GOHOSTOS}-${GOHOSTARCH} ## build an mgmt binary for current host os/arch
-	cp -a $< $@
+	@cp -a $< $@
 
 $(PROGRAM).static: $(GO_FILES) $(MCL_FILES)
 	@echo "Building: $(PROGRAM).static, version: $(SVERSION)..."

converger/converger_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package converger

engine/autoedge_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package engine

engine/graph/autogroup/autogroup_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package autogroup

engine/graph/graph_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package graph

engine/graph/semaphore_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package graph

engine/metaparams_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package engine

engine/resources/augeas.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !noaugeas
 // +build !noaugeas
 
 package resources

engine/resources/docker_container.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !nodocker
 // +build !nodocker
 
 package resources

engine/resources/docker_container_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !nodocker
 // +build !nodocker
 
 package resources

engine/resources/docker_image.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !nodocker
 // +build !nodocker
 
 package resources

engine/resources/exec_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/file_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/mount_linux_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root || !darwin
 // +build !root !darwin
 
 package resources

engine/resources/mount_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/msg_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/net.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package resources

engine/resources/net_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package resources

engine/resources/noop_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/pippet_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/pkg_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/resources_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/test_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package resources

engine/resources/virt.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !novirt
 // +build !novirt
 
 package resources

engine/util/mode_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package util

engine/util/util_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package util

integration/basic_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package integration

integration/util_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package integration

lang/funcs/core/core_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package core

lang/funcs/core/datetime/format_func_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package coredatetime

lang/funcs/core/sys/cpucount_fact.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package coresys

lang/funcs/core/sys/cpucount_fact_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package coresys

lang/funcs/core/sys/load_fact_darwin.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build darwin
 // +build darwin
 
 package coresys

lang/funcs/core/sys/load_fact_posix.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package coresys

lang/funcs/core/sys/uptime_fact_darwin.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build darwin
 // +build darwin
 
 package coresys

lang/funcs/core/sys/uptime_fact_posix.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !darwin
 // +build !darwin
 
 package coresys

lang/funcs/facts/func_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package facts

lang/funcs/funcs_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package funcs

lang/interfaces/metadata_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package interfaces

lang/interpolate_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lang

lang/interpret_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lang

lang/lang_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lang

lang/lexparse_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lang

lang/scope_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lang

lang/types/type_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package types

lang/types/value_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package types

lang/unification_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lang

lib/main_test.go

@@ -15,6 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !root
 // +build !root
 
 package lib