ceph-facts: use --admin-daemon to get fsid

ceph-facts: use --admin-daemon to get fsid

During the rolling_update scenario, the fsid value is retrieve from the
current ceph cluster configuration via the ceph daemon config command.
This command tries first to resolve the admin socket path via the
ceph-conf command.
Unfortunately this command won't work if you have a duplicate key in the
ceph configuration even if it only produces a warning. As a result the
task will fail.

Can't get admin socket path: unable to get conf option admin_socket for
mon.xxx: warning: line 13: 'osd_memory_target' in section 'osd' redefined

Instead of using ceph daemon we can use the --admin-daemon option
because we already know what the socket admin path value based on the
ceph cluster and mon hostname values.

Closes: #4492
Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>