Add CRUD for VirtualRouter top level resource and VirtualRouterPeer

[naveenchekuri]

…hild resource

This feature is to develop new cmdlets in order to support CRUD operations on new resource called virtualRouter under Microsoft.Network and peerings child resource under virtualRouter

Added following cmdlets

New-AzVirtualRouter
Remove-AzVirtualRouter
Get-AzVirtualRouter
Add-AzVirtualRouterPeer
Remove-AzVirtualRouterPeer
Get-AzVirtualRouterPeer
Update-AzVirtualRouterPeer

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• 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:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
  • the markdown help files have been regenerated using the commands listed here

[adxsdkps]

Can one of the admins verify this patch?

[wyunchi-ms]

Hi @naveenchekuri