Update README with relevant Manila information.
Update README with relevant Manila information.

Change-Id: I3cce6498ff6aa9c6a8a1395d2703a92daaf04c81

vponomaryov/manila,weiting-chen/manila,bswartz/manila,jcsp/manila,NetApp/manila,redhat-openstack/manila,openstack/manila,openstack/manila,jcsp/manila,bswartz/manila,weiting-chen/manila,NetApp/manila,aostapenko/manila,scality/manila,sajuptpm/manila,vponomaryov/manila,scality/manila,sajuptpm/manila,redhat-openstack/manila,aostapenko/manila,aostapenko/manila