Merge pull request #65411 from nikhita/fix-publishing-bot-fakeclient

Automatic merge from submit-queue (batch tested with PRs 63773, 65411). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

client-go/examples/fake-client: add doc.go to fix go build warnings

The publishing bot is currently broken (#56876 (comment)). This is due to the following error:

```
[24 Jun 18 15:08 UTC]: Running smoke tests for branch master
[24 Jun 18 15:08 UTC]: /bin/bash -xec "godep restore\ngo build ./...\ngo test $(go list ./... | grep -v /vendor/)\n"
	+ godep restore
	+ go build ./...
	go build k8s.io/client-go/examples/fake-client: no non-test Go files in /go-workspace/src/k8s.io/client-go/examples/fake-client
[24 Jun 18 15:09 UTC]: exit status 1
    	+ godep restore
    	+ go build ./...
    	go build k8s.io/client-go/examples/fake-client: no non-test Go files in /go-workspace/src/k8s.io/client-go/examples/fake-client

[24 Jun 18 15:09 UTC]: exit status 1```
```

The fakeclient package does not have any non-test go files. The test file was added in #65291 2 days ago.

This causes `go build` to give a warning: `no non-test Go files in /go-workspace/src/k8s.io/client-go/examples/fake-client`, which breaks the publishing bot. This PR adds a dummy doc.go file in the package to avoid this warning and fix the publishing bot.

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/client-go/examples/fake-client/BUILD

@@ -1,8 +1,9 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_test")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_test(
     name = "go_default_test",
     srcs = ["main_test.go"],
+    embed = [":go_default_library"],
     deps = [
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
@@ -25,3 +26,11 @@ filegroup(
     tags = ["automanaged"],
     visibility = ["//visibility:public"],
 )
+
+go_library(
+    name = "go_default_library",
+    srcs = ["doc.go"],
+    importmap = "k8s.io/kubernetes/vendor/k8s.io/client-go/examples/fake-client",
+    importpath = "k8s.io/client-go/examples/fake-client",
+    visibility = ["//visibility:public"],
+)

staging/src/k8s.io/client-go/examples/fake-client/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package fakeclient contains examples on how to use fakeclient in tests.
+// Note: This file is here to avoid warnings on go build since there are no
+// non-test files in this package.
+package fakeclient