PowerShell integration for Front Door service

[hytao]

Description

1. Old PR against Private Repo https://github.com/Azure/azure-powershell-pr/pull/395
2. PowerShell integration for Azure FrontDoor service.
3. Design Review link: Azure/azure-powershell-cmdlet-review-pr#132 Azure/azure-powershell-cmdlet-review-pr#165

Checklist

• [x ] I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate change log has been updated
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • the changes have gone through a cmdlet design review
  • the cmdlet markdown files were generated using the platyPS module

[maddieclayton]

@hytao I assume your SDK has now been published, so can you remove the two FrontDoor nuget packages from the LocalFeed?

[adxsdkps]

Can one of the admins verify this patch?

[maddieclayton]

@azuresdkci Add to whitelist

[maddieclayton]

@hytao Looks good to me! Merging now.