This patch updates client to support cluster related changes on the API
done on microversion 3.7.
Service listing will include "cluster_name" field and we have 4 new
commands, "cluster-list", "cluster-show", "cluster-enable" and
"cluster-disable".
Specs: https://review.openstack.org/327283
Implements: blueprint cinder-volume-active-active-support
Depends-On: If1ef3a80900ca6d117bf854ad3de142d93694adf
Change-Id: I824f46b876e21e552d9f0c5cd3e836f35ea31837