Automatic merge from submit-queue (batch tested with PRs 45346, 45903, 45958, 46042, 45975)

Azure disk api

This is to update the AzureDiskApi and split it from the implementation which is caught in rebase hell...

Once this is merged, we'll get the implementation in.

@smarterclayton suggested this as a way to break the rebase hell logjam. request for a quick review.

Thanks!