The V2 Api should delete a non existent image

Glance V2 api initiates the deletion of an image that
got deleted during upload. This ensures that there
are no orphaned chunks of the image left behind

Fixes bug #1226013

Change-Id: I4cf5c49d2a6d2157a38467d9f7bcb20c4562b642
Merge "The V2 Api should delete a non existent image"