pybind/mgr/cephadm: upgrade MDS if no MDS is "up"

pybind/mgr/cephadm: upgrade MDS if no MDS is "up"

The upgrade process can get stuck if an MDS crashes. This should be rare
when straddling v16.2.5 where the compatset of the file system inherits
the FSMap "default". The MDS from pre-v16.2.5 do not yet share a
compatset with the mons so the mons will do no promotions, causing
upgrade task to get stuck.

Fixes: https://tracker.ceph.com/issues/53074
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit d7717256644e45ba670165c6af0941461fb884f4)