Public bug reported:

With the recent introduction of triggering one test per reverse-
dependency kernel image, or in situations where a particular package
just happens to be in the queue more than once, we can potentially get
naming collisions. From http://autopkgtest.ubuntu.com/packages/n/nvidia-
graphics-drivers-304/wily/amd64/ I just saw:

| 2b419580-ac4c-4b94-a4dc-47e8ee5612e9 | 
adt-wily-amd64-nvidia-graphics-drivers-304-20150914-155306 | ACTIVE | -         
 | Running     | net_ues_proposed_migration=10.220.47.70 |
| 80a56c66-cbb0-4cd4-8488-16fb937c9ffb | 
adt-wily-amd64-nvidia-graphics-drivers-304-20150914-155306 | ACTIVE | -         
 | Running     | net_ues_proposed_migration=10.220.47.69 |

which led to

nova boot failed (attempt #1):
ERROR: Quota exceeded for instances: Requested 1, but already used 10 of 10 
instances (HTTP 413) (Request-ID: req-5540e478-1305-4a54-93c0-2869e084a437)
ERROR: Multiple server matches found for 
'adt-wily-amd64-nvidia-graphics-drivers-304-20150914-155306', use an ID to be 
more specific.
ERROR: Unable to delete any of the specified servers.

We need to use the instance's UUID instead of its name to avoid this.

** Affects: autopkgtest (Ubuntu)
     Importance: High
     Assignee: Martin Pitt (pitti)
         Status: In Progress

** Changed in: autopkgtest (Ubuntu)
       Status: New => In Progress

** Changed in: autopkgtest (Ubuntu)
   Importance: Undecided => High

** Changed in: autopkgtest (Ubuntu)
     Assignee: (unassigned) => Martin Pitt (pitti)

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https://bugs.launchpad.net/bugs/1495788

Title:
  nova: use UUIDs instead of instance names

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