Use devstack functions for registering Manila
Use devstack functions for registering Manila

Use devstack functions for registration of Manila to avoid
incompatibilities in service registering approach. Also, we should
reuse already defined functions that minimizes our code removing
duplication.

Change-Id: Id6e56426b212435366a36122dbeddc52910d9828
Closes-Bug: #1492133

vponomaryov/manila,jcsp/manila,NetApp/manila,scality/manila,vponomaryov/manila,bswartz/manila,redhat-openstack/manila,redhat-openstack/manila,NetApp/manila,openstack/manila,scality/manila,jcsp/manila,bswartz/manila,openstack/manila