Only process ADMX files when loading policies

[twangboy]

What does this PR do?

Fixes an issue with processing non ADMX files in the Policy Definitions directory.

What issues does this PR fix or reference?

https://gitlab.com/saltstack/enterprise/lock/issues/3826

Previous Behavior

lgpo.get_policy_info would fail with the following stacktrace

  File "c:\salt\bin\site-packages\salt-3000-py3.5.egg\salt\utils\templates.py", line 392, in render_jinja_tmpl
    output = template.render(**decoded_context)
  File "c:\salt\bin\lib\site-packages\jinja2\environment.py",line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "c:\salt\bin\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "c:\salt\bin\lib\site-packages\jinja2\_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "<template>", line 16, in top-level template code
  File "c:\salt\bin\lib\site-packages\salt-3000-py3.5.egg\salt\modules\win_lgpo.py", line 7759, in get_policy_info
    adml_language=adml_language)
  File "c:\salt\bin\lib\site-packages\salt-3000-py3.5.egg\salt\modules\win_lgpo.py", line 7398, in _lookup_admin_template
    admx_policy_definitions = _get_policy_definitions(language=adml_language)
  Files "c:\salt\bin\lib\site-packages\salt-3000-py3.5.egg\salt\modules\win_lgpo.py", line 5105, in _get_policy_definitions
    _load_policy_definitions(path=path,language=language)
  File "c:\salt\bin\lib\site-packages\salt-3000-py3.5.egg\salt\modules\win_lgpo.py, line 5006, in _load_policy_definitions
    namespaces=namespaces)[0]

New Behavior

Non-ADMX files are skipped, no stacktrace

Tests written?

Oui

Commits signed with GPG?

Yes

[Ch3LL]

just needs some test coverage.

[twangboy]

Added some tests

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2d78931). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master   #56310   +/-   ##
=========================================
  Coverage          ?   17.41%           
=========================================
  Files             ?     1234           
  Lines             ?   232648           
  Branches          ?    50745           
=========================================
  Hits              ?    40517           
  Misses            ?   189110           
  Partials          ?     3021

Flag	Coverage Δ
#archlts	16.69% <0%> (?)
#centos7	24.42% <ø> (?)
#proxy	24.48% <ø> (?)
#py2	17.21% <0%> (?)
#py3	17.08% <0%> (?)
#runtests	17.41% <0%> (?)
#ubuntu1604	24.43% <ø> (?)
#zeromq	17.41% <0%> (?)

Impacted Files	Coverage Δ
salt/modules/win_lgpo.py	6% <0%> (ø)

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2d78931). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master   #56310   +/-   ##
=========================================
  Coverage          ?   17.41%           
=========================================
  Files             ?     1234           
  Lines             ?   232648           
  Branches          ?    50745           
=========================================
  Hits              ?    40517           
  Misses            ?   189110           
  Partials          ?     3021

Flag	Coverage Δ
#archlts	16.69% <0%> (?)
#centos7	24.42% <ø> (?)
#proxy	24.48% <ø> (?)
#py2	17.21% <0%> (?)
#py3	17.08% <0%> (?)
#runtests	17.41% <0%> (?)
#ubuntu1604	24.43% <ø> (?)
#zeromq	17.41% <0%> (?)

Impacted Files	Coverage Δ
salt/modules/win_lgpo.py	6% <0%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2d78931...4bc5b05. Read the comment docs.