SqlAlwaysOnService: Resolve failing integration test

[johlju]

Pull Request (PR) description

• Changes to SqlAlwaysOnService
  • Integration tests was updated to handle new IPv6 addresses on the AppVeyor
    build worker (issue SqlAlwaysOnService: BLOCKING RELEASE: Integration tests have started failing (on updated build worker image?) #1155)

This Pull Request (PR) fixes the following issues

Fixes #1155

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 

[codecov-io]

Codecov Report

Merging #1169 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##            dev   #1169   +/-   ##
====================================
  Coverage    97%     97%           
====================================
  Files        33      33           
  Lines      4005    4005           
====================================
  Hits       3916    3916           
  Misses       89      89

[johlju]

Merging this as soon as the tests passes since this resolved a blocking release issue (and blocks any other PR's from merging).

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Reviewed 2 of 2 files at r1.
Review status: complete! all files reviewed, all discussions resolved

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Comments from Reviewable