osd/OSDMap: make cluster addrs addrvecs too

osd/OSDMap: make cluster addrs addrvecs too

This will allow a single-step upgrade from msgr1 to msgr2: as each
nautilus OSD starts up, it will bind to both msgr1 and msgr2 addrs
(assuming it starts up after the mons have been upgraded).  Peer OSDs will
use the msgr2 address if they can, or the legacy one if they can't.
Once require_osd_release >= nautilus OSDs will stop binding to msgr1
ports at all.

Signed-off-by: Sage Weil <sage@redhat.com>