National roaming info for Drei in Austria

3AT roams in T-Mobile AT networks

Change-Id: I915edccf92bcbb088fa25b958eb345c624f61597
National Roaming: Allow T-Mobile AT (MNC03) to roam on 3 AT (MNC10) in Austria

Change-Id: Ief827259fdcb5bfa13bd643f80a8547a56cc934c