[tor-bugs] #16762 [Tor]: Move most of directory_all_unreachable into a backend callback

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#16762: Move most of directory_all_unreachable into a backend callback
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     Reporter:  nickm      |      Owner:
         Type:             |     Status:  needs_review
  enhancement              |  Milestone:  Tor: 0.2.7.x-final
     Priority:  normal     |    Version:
    Component:  Tor        |   Keywords:  sponsorS, blob, TorCoreTeam201508
   Resolution:             |  Parent ID:  #16764
Actual Points:             |
       Points:             |
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Comment (by teor):

 I wonder if we need to check return values on tor_event_new and
 event_active.
 Otherwise, this patch looks good - more patches like this!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16762#comment:4>
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