SqlServerMaxDop: Fix for #396 (#1644)

[Fiander]

• SqlMaxDop
  • Fixes issue SqlServerMaxDop: Should return values for Ensure and DynamicAlloc when Get-DscConfiguration is called dsccommunity/SqlServerDsc#396. Added three return values in Get-Target resource.

Pull Request (PR) description

This Pull Request (PR) fixes the following issues

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 updated in the resource's README.md.
• Resource parameter descriptions updated in schema.mof.
• Comment-based help updated, including parameter descriptions.
• Localization strings updated.
• Examples updated.
• Unit tests updated. See DSC Community Testing Guidelines.
• Integration tests updated (where possible). See DSC Community Testing Guidelines.
• Code changes adheres to DSC Community Style Guidelines.