[BUG] aptpkg: Updating held packages via sources does not work

[krombel]

Description
When installing packages via state pkg.installed by using the sources arg updating of held packages does not work.

Setup

common-pkgs:
  pkg.installed:
    - sources:
      - pkg1: salt://common/pkg1_{{ pkg1_version }}.deb
      - pkg2: salt://common/pkg2_{{ pkg2_version }}.deb
    - hold: True
    - update_holds: True

Steps to Reproduce the behavior

# salt-call state.apply common
local:
----------
          ID: common-pkgs
    Function: pkg.installed
      Result: False
     Comment: Problem encountered installing package(s). Additional info follows:
              
              errors:
                  - Running scope as unit: run-rc481e0a775024bad8e2077bd25caa6d3.scope
                    E: Held packages were changed and -y was used without --allow-change-held-packages.
     Started: 11:21:49.207895
    Duration: 12991.293 ms
     Changes:

Expected behavior
update would be working

Versions Report
3007.0

Additional context
In debug logs I see folloging line:

[DEBUG   ] Current version (['1.0.8922-1']) did not match desired version specification (salt://common/pkg1_1.0.9457-1.deb), adding to installation targets

It seems, that all_pkgs in aptpkg.py does contain the path an not the package name
=> pkg1 will not be added to the to_unhold array so it wont be "unholded" before the install is triggered.

I see 2 possible approaches to fix this:

1. extend targeted_names with the keys of the sources dict so this package gets added to_unhold
2. pass --allow-change-held-packages (introduced in 1.1 as successor for the --force-yes param) to apt - e.g. by using update_holds which is documented as working for apt, yum and zypper but seems to only be implemented for yum.

The second approach has the charme, that the implementation around to_unhold might be completely be skipped by making this param "responsible" for allowing updates.

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