Use glanceclient's inbuilt images find
Use glanceclient's inbuilt images find

Glanceclient image listing was special cased as it wasn't implemented in
glanceclient directly. This is no longer the case and we should use
glanceclient's functions.

Change-Id: If8d1246f1bd97c07f9f10f5457aa32124efa0be3

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