MSFT_GroupResource: Fix for the issue #82

[SDedik]

Pull Request (PR) description

This PR implements proposed workaround for the issue #82. See the issue discussion for the details.

This Pull Request (PR) fixes the following issues

• Fixes Group: Unable to add Different forest User to Local Group #82

Task list

• Added an entry under the Unreleased section 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.

[ghost]

All CLA requirements met.

[Sudman1]

The changes look sound and only apply on error.

[SDedik]

Awesome, thank you. Now somebody with write permissions to the repository should merge it.

[PlagueHO]

Thank you very much for contributing this!

If we make the change in this repo, then we should also submit the same change to the xPSDesiredStateConfiguration repository as well: https://github.com/dsccommunity/xPSDesiredStateConfiguration - Ideally we should try and keep these in sync.

[SDedik]

Regarding the xPSDesiredStateConfiguration repo. Once all the changes are finalized and ready to be merged, I will fork the xPSDesiredStateConfiguration and create a PR with proposed changes to keep them in sync. Don't want to do it prematurely to avoid having to make changes in 2 places at once.