Allow Rook to rotate CephX keys for Ceph v19.2.3 and up with the
exception of Ceph mons. While v19.2.3 has the `ceph auth rotate` command
that Rook needs to perform key rotation, there is still ongoing work in
Ceph to change how the `mon.` key is tracked internally. Rook's mon key
rotation requires those currently-unreleased Ceph changes.
Signed-off-by: Blaine Gardner <blaine.gardner@ibm.com>
(cherry picked from commit a952b7511a)