Unable to create volume with the same name as the one deleted.

[shampur]

To recreate:
* Create a volume.
* Take a snapshot.
* Copy the snapshot into a new volume.
* After this you will have -
storagePolicy1/vol1
storagePolicy1/vol1copy
* delete both volumes.
Now if I try to create storagePolicy1/vol1 it's throwing an error saying volume exists, But when I do a list-all it does not show up.