Change V2 image tests to actually run V2 image code

The current tests for image do not run v2 image code, changing
that portion also made it's only test fail.
I opted to change the image delete code and not the test, since
passing the object ID is more in line with the rest of the
project code.

Change-Id: I62e13c063a5d68279dbbf31e59266db6285d73bf

openstackclient/image/v2/image.py

@@ -48,7 +48,7 @@ class DeleteImage(command.Command):
             image_client.images,
             parsed_args.image,
         )
-        image_client.images.delete(image)
+        image_client.images.delete(image.id)
 
 
 class ListImage(lister.Lister):

openstackclient/tests/image/v2/test_image.py

@@ -15,7 +15,7 @@
 
 import copy
 
-from openstackclient.image.v1 import image
+from openstackclient.image.v2 import image
 from openstackclient.tests import fakes
 from openstackclient.tests.image.v2 import fakes as image_fakes