[tor-bugs] #3457 [Tor Client]: Expose more circuit state-change events to controllers

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#3457: Expose more circuit state-change events to controllers
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 Reporter:  rransom        |          Owner:  rransom           
     Type:  enhancement    |         Status:  needs_review      
 Priority:  normal         |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Client     |        Version:                    
 Keywords:  small-feature  |         Parent:                    
   Points:                 |   Actualpoints:                    
---------------------------+------------------------------------------------

Comment(by rransom):

 Replying to [comment:13 nickm]:
 > See branch feature3457-v4-nm in my public repository. It looks okay to
 me, but could probably use at least cursory review.

 Looks good!  (The unit tests for `format_iso_time` et al. are great!)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3457#comment:14>
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