[tor-bugs] #7672 [Stem]: fix ProtocolError location

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#7672: fix ProtocolError location
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 Reporter:  robinson  |          Owner:  atagar
     Type:  defect    |         Status:  new   
 Priority:  normal    |      Milestone:        
Component:  Stem      |        Version:        
 Keywords:            |         Parent:        
   Points:            |   Actualpoints:        
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 Change stem.socket.ProtocolError to stem.ProtocolError.

 Pull from fix-event-errors branch @ git://gitorious.org/stem-robinson
 /stem-robinson.git

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7672>
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