Group: fix error if Iis apppool is in local group members

[machgo]

Pull Request (PR) description

This PR fixes an error, which occures if the local group has a member with the following format "IIS APPPOOL\xxx". The same problem was already fixed for "NT AUTHORITY\xxx" in dsccommunity/xPSDesiredStateConfiguration#314

This Pull Request (PR) fixes the following issues

none

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.

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This change is 

[gaelcolas]

Hi, as per other comment, it'd be wise to submit that change to xPSDesiredStateConfiguration.

While I check if the fix should be merged in, could you update the tests to go along with your change please?
https://github.com/PowerShell/PSDscResources/blob/dev/Tests/Unit/MSFT_GroupResource.Tests.ps1#L298-L312

Thanks

Reviewable status: 0 of 2 files reviewed, all discussions resolved