[tor-bugs] #7741 [Stem]: small speed-up to event listener tests

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#7741: small speed-up to event listener tests
-------------------------+--------------------------------------------------
 Reporter:  robinson     |          Owner:  atagar
     Type:  enhancement  |         Status:  new   
 Priority:  normal       |      Milestone:        
Component:  Stem         |        Version:        
 Keywords:  testing      |         Parent:        
   Points:               |   Actualpoints:        
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 Since the event handler is already threaded, use threading.Event to wait
 for event arrival or a timeout.

 https://gitorious.org/stem-robinson/stem-robinson/commits/exp-threaded-
 tests

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7741>
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