Move setting of DSCMachineStatus to helper function

[mhendric]

Pull Request (PR) description

Move setting of DSCMachineStatus to helper function

This Pull Request (PR) fixes the following issues

• Fixes PSSA complains about Suppression Message Attribute being used wrongly #407

Task list

• 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).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[mhendric]

@manigandan-jegannathan-developer can you give this code change a review when you get a chance? Thanks.

[codecov-io]

Codecov Report

Merging #408 into dev will increase coverage by 0.01%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##              dev     #408      +/-   ##
==========================================
+ Coverage   40.17%   40.18%   +0.01%     
==========================================
  Files          39       39              
  Lines        4767     4768       +1     
==========================================
+ Hits         1915     1916       +1     
  Misses       2852     2852

Impacted Files	Coverage Δ
...ber/MSFT_xExchDatabaseAvailabilityGroupMember.psm1	35.13% <0%> (ø)	⬆️
...chJetstressCleanup/MSFT_xExchJetstressCleanup.psm1	5.5% <0%> (ø)	⬆️
...urces/MSFT_xExchJetstress/MSFT_xExchJetstress.psm1	8.6% <0%> (ø)	⬆️
Modules/xExchangeHelper.psm1	96.21% <100%> (ø)	⬆️

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[jegannathanmaniganadan]

@mhendric Looks fine to me from PSSA perspective.