Add better caching around volumes
Add better caching around volumes

dtroyer/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk,jsmartin/shade,dtroyer/python-openstacksdk,openstack-infra/shade,openstack-infra/shade,jsmartin/shade