[tor-bugs] #22355 [Core Tor/Tor]: Update dir-spec with client fallback directory mirror attempt and timeout behaviour

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#22355: Update dir-spec with client fallback directory mirror attempt and timeout
behaviour
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  torspec
Actual Points:                |  Parent ID:
       Points:  0.5           |   Reviewer:
      Sponsor:                |
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 Let's add these lines:

 Clients try several fallback directory mirrors, and use the first one that
 connects. Each attempt happens after a short delay, regardless of the
 state of the previous attempt, until at least one attempt has connected.

 When several fallback directory mirrors have failed, clients start trying
 directory authorities in a similar fashion.

 Somewhere near:

 https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n3292

 I don't think we designed any explicit timeout behaviour, so we are
 probably using whatever was there before 0.2.8.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22355>
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