Move image private tests to BaseTestClass
Move image private tests to BaseTestClass

Change-Id: Ib2ca8e853765b33e19bfb271b4294c979fd91e2b

hayderimran7/ec2-api,stackforge/ec2-api,openstack/ec2-api,stackforge/ec2-api,hayderimran7/ec2-api,openstack/ec2-api