always enable haproxy for swift or radosgw in HA

Setup Swift HAProxy when Swift is enabled either for glance or for
objects, not just when it's enabled for glance. Setup RadosGW HAProxy
when Swift is disabled and RadosGW is enabled. Use active-passive
balancing for RadosGW.
Merge pull request #749 from xarses/ceph-swift-haproxy

always enable haproxy for swift or radosgw in HA