Quota releasing on snapshot deleting bug fixed.
Quota releasing on snapshot deleting bug fixed.

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