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

Change-Id: I2cc0163b25e772786b9c64dca9d354bc4d66044c