demo: do not bootstrap mgr on jewel
demo: do not bootstrap mgr on jewel

We don't have official images before Jewel so it's safe to make an
exception only for this.

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

JrCs/ceph-docker,ceph/ceph-docker,ceph/ceph-docker,JrCs/ceph-docker,JrCs/ceph-docker