Add functional tests for snapshots
Add functional tests for snapshots

Change-Id: I863583d6c8263d144d45a0443fc6af04301d23e7

redhat-openstack/python-openstackclient,dtroyer/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient,redhat-openstack/python-openstackclient,openstack/python-openstackclient