cls/rbd: sanitize the mirror image status peer address after reading from disk

cls/rbd: sanitize the mirror image status peer address after reading from disk

RADOS upgrade tests were failing when OSDs were partially upgraded since the
entity_addr_t::type overload wasn't being recovered when re-read. Now we will
always sanitize the on-disk entity address after reading it to avoid such
issues of on-disk encoding/decoding.

Fixes: https://tracker.ceph.com/issues/42891
Signed-off-by: Jason Dillaman <dillaman@redhat.com>
(cherry picked from commit 1542d12e1b893166a5bc7b7a4c9a4474078a98be)

Conflicts:
	src/cls/rbd/cls_rbd(_types).[h|cc]: the MirrorImageStatusOnDisk struct has moved