Hashtable check - Fix for DSC composite resources

[SSvilen]

Pull Request (PR) description

As mentioned in this PR, the DSC composite resources are also being parsed as hashtables. I have wrote a fix, that should remove the false/positives on those resources. I have tested it against few DSC Resources - I have not observed any false positives.

This Pull Request (PR) fixes the following issues

PR

Task list

• [x] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Documentation added/updated in README.md.
• [ ] Comment-based help added/updated for all new/changed functions.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Unit tests added/updated.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #356 into dev will increase coverage by <1%. The diff coverage is 100%.

@@         Coverage Diff          @@
##            dev   #356    +/-   ##
====================================
+ Coverage    84%    84%   +<1%     
====================================
  Files        12     12            
  Lines      1750   1750            
  Branches      2      2            
====================================
+ Hits       1474   1477     +3     
+ Misses      274    271     -3     
  Partials      2      2

[mhendric]

Hey @SSvilen and @PlagueHO , just wanted to check on the review status for this one. Not sure who owns the next action at the moment...

[SSvilen]

I think @PlagueHO or @johlju needs to review the change. @gaelcolas already merged that change in the new DscResource.AnalyzerRules module.