Add AAD authentication options to 'az network vnet-gateway'

[anton-evseev]

Resource Provider
Microsoft.Network

Description of Feature or Work Requested
Need to add three string properties used to configure AAD authentication in VirtualNeworkGateway

Minimum API Version Required
2019-04-01

Swagger Link
Azure/azure-rest-api-specs#5935

Target Date
No specific target, these are missing properties found by comparing Swagger and CLI

[anton-evseev]

cc: @Nilambari

[mmyyrroonn]

@number213 Thanks. I will put this one into our work list.

[haroldrandom]

@number213 Hi, I have some questions for you to make this request more clear.

Do you want us to add three keyword arguments to only this commands az network vnet-gateway create ?

[anton-evseev]

Also to az network vnet-gateway update

[haroldrandom]

Working on it.

Could you provide some examples to demonstrate how to use these three arguments in requests?