[automerger skipped] Test that if an RA sets the same prefix as DNS, nothing happens. am: fbf205a380 am: bc7b68512d am: 627e36992b -s ours

am skip reason: Change-Id I3316d49d42100800740afadc4edf0a13a4d8377c with SHA-1 4afb82b32e is in history

Change-Id: I3df201e84534868fcca0deb79db41e1129cba284