SqlSetup: Merge integration tests into the same script

[johlju]

Pull Request (PR) description

• Changes to SqlSetup
  • Join integration tests into the same script (issue SqlSetup: Integration tests for SQL Server 2016 and SQL Server 2017 should use the same test config- and script file #1291).
  • Updated reference to issue SQLSetup Ressource Combines InstallSQLDataDir and SQLUserDBDir for systemdatabases #1287.

No change log entry was added because there are already suitable change log entries.

This Pull Request (PR) fixes the following issues

• Fixes SqlSetup: Integration tests for SQL Server 2016 and SQL Server 2017 should use the same test config- and script file #1291
• Fixes SQLSetup Ressource Combines InstallSQLDataDir and SQLUserDBDir for systemdatabases #1287

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 

[codecov-io]

Codecov Report

Merging #1296 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##            dev   #1296   +/-   ##
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  Coverage    97%     97%           
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  Files        35      35           
  Lines      4432    4432           
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  Hits       4327    4327           
  Misses      105     105

[johlju]

Reviewed 5 of 5 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

[johlju]

For some reason CLA did not get reported. Closing and reopening PR to kick off the CLA bot again.