Drop both exchanges used by naily

- deleting both exchanges in case of precondition failure

Naily will be able to auto_recover using consumer cancel notifications

For additional info look at astute patch and correcponding bug:
  I28d44841a207585d5d7b4a7920b58132be7b7394

Change-Id: I77c24badaa09ab73d83316ec4665df393966322e
Partial-Bug: #1340555
Merge "Drop both exchanges used by naily"