ceph: external refuse cluster older than Nautilus
ceph: external refuse cluster older than Nautilus

The external cluster must run at least on Nautilus. The main reason
being the msgr2 knowledge by the Operator and the Ceph CLI.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

rook/rook,rook/nfs,rook/rook,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/rook