rsync configurations to support multi-node swift

Right now we only support an all-in-one swift node. To go
to multi-node swift we need to configure rsync for replication.

See http://docs.openstack.org/havana/install-guide/install/yum/content/installing-and-configuring-storage-nodes.html

Depends on a service mapping change for diskimage-builder:
https://review.openstack.org/#/c/76753/

Change-Id: Idd3b408e3ef900fa6223c2762b2f6744f179bc00
Merge "rsync configurations to support multi-node swift"