Azure module prerequisite: `EnableAPIServerVnetIntegrationPreview` is not enabled.

[bobbyiliev]

Just noting this down here so I don’t forget. When trying to run the new Azure TF module in the Azure mz-scratch account, I hit:

Feature Microsoft.ContainerService/EnableAPIServerVnetIntegrationPreview is not enabled.

Maybe worth documenting this as a requirement somewhere?

eg:

# Check the status:
az feature show \
  --namespace Microsoft.ContainerService \
  --name EnableAPIServerVnetIntegrationPreview

# Enable:
az feature register \
  --namespace Microsoft.ContainerService \
  --name EnableAPIServerVnetIntegrationPreview