librbd: Watcher should not attempt to re-watch after detecting blacklisting
Currently, the Watcher state machine will spin as fast as it can sending
re-watch requests to the OSD and then retrying after it fails with the
EBLACKLISTED error. Treat a blacklisting similarly to how removal of the
object is treated: stop attempting to re-watch.
Fixes: https://tracker.ceph.com/issues/45715 Signed-off-by: Jason Dillaman <dillaman@redhat.com>