[tor-bugs] #7778 [Stem]: fix tests to use string ids

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#7778: fix tests to use string ids
----------------------+-----------------------------------------------------
 Reporter:  robinson  |          Owner:  atagar
     Type:  defect    |         Status:  new   
 Priority:  normal    |      Milestone:        
Component:  Stem      |        Version:        
 Keywords:  testing   |         Parent:        
   Points:            |   Actualpoints:        
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 After the correction to circuit and stream id types (commit
 6711458be83b2050), the tests for close_circuit, repurpose_circuit, and
 extend_ciruit do not work correctly.  I have three simple fixes[0] ready
 to pull.

 [0]: https://gitorious.org/stem-robinson/stem-robinson/commits/fix-test-
 controller

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7778>
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