New resource DhcpServerAuthorization & add Networks support to FailoverCluster

[stehlih]

Pull Request

Added

• AddsDomainController:
  • add UnprotectFromAccidentalDeletion to allow dc promote if an existing AD computer account is protected
• DhcpServerAuthorization:
  • new resource to authorize DHCP server in AD
• FailoverCluster:
  • add Networks support
  • add installation of required Windows Features
  • update documentation

Changed

• DHCPServer:
  • fix EnableSecurityGroups if resource is not running on a domain controller
• HyperV:
  • remove unused code after migration to HyperVDsc

Task list

• The PR represents a single logical change. i.e. Cosmetic updates should go in different PRs.
• Added an entry under the Unreleased section of in the CHANGELOG.md as per format.
• Local clean build passes without issue or fail tests (build.ps1 -ResolveDependency).
• 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