rolling_update: get fsid in mgr pre_task
rolling_update: get fsid in mgr pre_task

{{ fsid }} points to {{ cluster_uuid.stdout }} which is not defined in
this part of the rolling_update playbook.
Since we need to call {{ fsid }} we must get the fsid and register it to
`cluster_uuid`.

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

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