[automerger skipped] Test that if an RA sets the same prefix as DNS, nothing happens. am: fbf205a380 -s ours am: d30611e229 -s ours am: c02f887698 -s ours am: 56cb9ef8f9 -s ours

am skip reason: Change-Id I3316d49d42100800740afadc4edf0a13a4d8377c with SHA-1 fbf205a380 is in history

Change-Id: Ib2211cb849a9235fdbe1536ee8c352e551df61aa