[tor-bugs] #34037 [Core Tor/Chutney]: Make chutney check tor's logs for reachability self-test success

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#34037: Make chutney check tor's logs for reachability self-test success
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     Reporter:  teor              |      Owner:  (none)
         Type:  enhancement       |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Chutney  |    Version:
     Severity:  Normal            |   Keywords:  ipv6, prop311
Actual Points:                    |  Parent ID:  #33050
       Points:  2                 |   Reviewer:
      Sponsor:  Sponsor55-can     |
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 This ticket is an alternative to #33407.

 Instead of fixing bridge descriptor uploads, we can check bridge logs to
 make sure that reachability self-tests have succeeded.

 For consistency, we should also do the same checks for relays.

 We can only do these tests on authorities, relays, and bridges that are
 configured with `AssumeReachable 0`. Chutney's current defaults are:
 * directory authorities: 1
 * bridge authorities: 1
 * relays: 0
 * bridges: 0
 * clients: clients never perform reachability self-tests

 Some custom chutney networks may set `AssumeReachable 1` for relays and
 bridges. So we should make it easy for them to disable these checks.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34037>
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