Add volume_type support to node group templates
Add volume_type support to node group templates

Change-Id: I38e19719f7ffd50f48217fc94bc7179928131597
Closes-Bug: #1369574

citrix-openstack-build/python-saharaclient,openstack/python-saharaclient,citrix-openstack-build/python-saharaclient,citrix-openstack-build/python-saharaclient