rolling_update: add role ceph-iscsi-gw
rolling_update: add role ceph-iscsi-gw

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1575829
Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>
(cherry picked from commit e91648a7afab88e84aea64c6bb7627580d420466)

fgal/ceph-ansible,fgal/ceph-ansible