Update AD-DCDeploy.ps1

Updated the DC deployment script to configure a static internal IP, using this newest networking feature. Once static, even if you stop the VM and restart it, you will acquire the same internal address, allowing AD/DNS to continue to function in the farm. 

You can later investigate this static IP later using the below command. 

Get-AzureVM -ServiceName $ServiceName -Name $VMName | Get-AzureStaticVNETIP

Corey