rbd-mirror: improve detection of blacklisted state

rbd-mirror: improve detection of blacklisted state

Fixes: https://tracker.ceph.com/issues/44159
Signed-off-by: Mykola Golub <mgolub@suse.com>
(cherry picked from commit cfb4f423a42d0265cb78ebb4eb8cc6924d6f45fa)

Conflicts:
	src/tools/rbd_mirror/InstanceReplayer.h (ceph::mutex vs Mutex)
        src/tools/rbd_mirror/InstanceReplayer.cc (Mutex::Locker vs  std::lock_guard)
        src/tools/rbd_mirror/LeaderWatcher.cc (Mutex::Locker vs  std::lock_guard)
	src/tools/rbd_mirror/NamespaceReplayer.cc (does not exist)
	src/tools/rbd_mirror/PoolReplayer.cc (code from NamespaceReplayer is here)
	src/test/rbd_mirror/test_mock_PoolReplayer.cc (does not exist)