Images not deleted after failure in test_Images.py tests

There is no tearDownClass because there are no images created in the setUpClass method. Test methods that create images must clean up after themselves.

Each test method (such as test_create_delete_image() should be changed to use the following strategy:

    def test_blah(self):
        try:
            # Create servers and/or images
            # Test what needs to be tested
        finally:
            # Delete servers and images as needed