rolling_update: create missing keyring only on running mon
rolling_update: create missing keyring only on running mon

try to create the potentially missing keys only on monitors that are
actually running.
The current node being played is stopped before this task.
By the way, delegating the command on all nodes but the current node
being played ensures that the generated keys will be present on all
monitors.

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible