Prefer volumev3 and volumev2 endpoints over volume
Prefer volumev3 and volumev2 endpoints over volume

Make cinderclient use volumev3 or volumev2 endpoints, before
falling back to the volume endpoint, otherwise Horizon is
trying to use the v1 API, and that doesn't work with the
"sort" parameter that we are using, resulting in an empty
volumes list.

Change-Id: Id03988d89000c4bc976090c68a41ee320b9d43f7
Closes-bug: #1700977

yeming233/horizon,ChameleonCloud/horizon,noironetworks/horizon,BiznetGIO/horizon,BiznetGIO/horizon,openstack/horizon,ChameleonCloud/horizon,openstack/horizon,NeCTAR-RC/horizon,ChameleonCloud/horizon,NeCTAR-RC/horizon,BiznetGIO/horizon,openstack/horizon,BiznetGIO/horizon,yeming233/horizon,ChameleonCloud/horizon,yeming233/horizon,noironetworks/horizon,yeming233/horizon,openstack/horizon,noironetworks/horizon,NeCTAR-RC/horizon,NeCTAR-RC/horizon,noironetworks/horizon