Fixed Compare-DscParameterState returning false positive when parameter with an empty hashtable or CimInstance property is passed in DesriedValues - fixes issue #65

[NicolasBn]

Pull Request (PR) description

• Correction to Compare-DscParameterState returning false positive when parameter
  with an empty hashtable or CimInstance property is passed in DesriedValues - fixes
  issue #65.
• Correction somes problems in Compare-DscParameterState - see issue #70 :
  • When you use -ReverseCheck, this value is used in recursive call of
    Test-DscParameterState and Compare-DscParameterState, and that called
    another time the function.
  • When you use -Properties and -ReverseCheck, and you have an array in member,
    that return a wrong value, because the properties are set in recursive calls of
    -ReverseCheck to test the value of array.
  • When you use -ReverseCheck and, in the function Test-DscSompareState/Compare-DscParameterState
    are recursively called (like to test or compare value of array), -ReverseCheck
    value is removed from $PSBoundParameter. And the ReverseCheck isn't done.

This Pull Request (PR) fixes the following issues

- Fixes #70 
- Fixes #65 

Task list

• Added an entry to the change log under the Unreleased section of the
  file CHANGELOG.md. Entry should say what was changed and how that
  affects users (if applicable), and reference the issue being resolved
  (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.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where possible). See
  DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

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[gaelcolas]

Thanks @NicolasBn, that looks good to me but I'd like @raandree to have a quick look too before we click merge.

Reviewed 1 of 4 files at r1, 3 of 3 files at r2.
Reviewable status: all files reviewed, 4 unresolved discussions (waiting on @NicolasBn)