* Register Swift-compatible endpoints in Keystone
* Load balance across RadosGW API servers using HAProxy
The support is exercised in the cephadm CI jobs, but since RGW is
not currently enabled via cephadm, it is not yet tested.
https://docs.ceph.com/en/latest/radosgw/keystone/
Implements: blueprint ceph-rgw
Change-Id: I891c3ed4ed93512607afe65a42dd99596fd4dbf9