BREAKING CHANGE: SqlSetup: Fix AgtSvcStartupType to not default to Automatic

[johlju]

Pull Request (PR) description

• SqlSetup
  • BREAKING CHANGE: Now if the parameter AgtSvcStartupType is not specified
    in the configuration the resource will no longer by default add an
    argument to setup.exe with a value of Automatic for the argument
    AGTSVCSTARTUPTYPE. If the parameter AgtSvcStartupType is not specified
    in the configuration there will be no setup argument added at all
    (issue SqlSetup: Agent service is hard coded to start automatically #464).

This Pull Request (PR) fixes the following issues

• Fixes SqlSetup: Agent service is hard coded to start automatically #464

Task list

• 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).
• 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 Community Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov]

Codecov Report

Merging #1529 into master will increase coverage by 0%.
The diff coverage is 44%.

@@          Coverage Diff           @@
##           master   #1529   +/-   ##
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  Coverage      98%     98%           
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  Files          39      39           
  Lines        5942    5923   -19     
======================================
- Hits         5832    5814   -18     
+ Misses        110     109    -1     

[johlju]

Reviewed 2 of 3 files at r1, 1 of 1 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved