[tor-bugs] #33639 [Core Tor/Tor]: Add CHANNEL_CLOSED reason to specs

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#33639: Add CHANNEL_CLOSED reason to specs
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     Reporter:  gk            |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-spec
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 I was recently looking at stem debug logs and found
 {{{
 2020-03-17 21:10:58,838 stem [INFO] CIRC event had an unrecognized
 remote_reason (CHANNEL_CLOSED). Maybe a new addition to the control
 protocol? Full Event: 'CIRC 6 FAILED
 $0CDD60E4015EBF2C3B5D32A2B9CC8FE6C98A5C33~UnivUtah3 PURPOSE=GENERAL
 TIME_CREATED=2020-03-17T20:10:25.388134 REASON=DESTROYED
 REMOTE_REASON=CHANNEL_CLOSED'
 }}}
 I am not sure how the `stem` workflow works but I guess it's an
 implementation based on the spec(s) (not what is actually used/allowed in
 the tor code).

 Thus, we should fix the spec(s) first so we can add the respective `stem`
 part later on.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33639>
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