Added functional tests for compute image API
Added functional tests for compute image API

Change-Id: Iddbcf4791448a4a2038422ea620b6b70b77114fe

briancurtin/python-openstacksdk,mtougeron/python-openstacksdk,dudymas/python-openstacksdk,dudymas/python-openstacksdk,openstack/python-openstacksdk,briancurtin/python-openstacksdk,stackforge/python-openstacksdk,mtougeron/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk