BugFix for Adding DP to Groups

[jeffotterpohl]

Pull Request (PR) description

BugFix for when adding DistributionPoint to a DistributionGroup immediately after adding the Distribution Point would cause an error. Running the code again after the failure would result in a success. A timeout is needed to allow for the Distribution Point to fully initialize prior to adding to a group.

This Pull Request (PR) fixes the following issues

Task list

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

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This change is 

[codecov[bot]]

Codecov Report

Merging #64 into master will increase coverage by 0%. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #64   +/-   ##
=====================================
  Coverage      97%    97%           
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  Files          33     33           
  Lines        3552   3568   +16     
=====================================
+ Hits         3464   3480   +16     
  Misses         88     88