[tor-bugs] #34137 [Core Tor/Tor]: Make sure inform_testing_reachability() reports the correct ports

[Tor Bug Tracker & Wiki]

#34137: Make sure inform_testing_reachability() reports the correct ports
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     Reporter:  teor           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  ipv6, prop311, technical-debt
Actual Points:                 |  Parent ID:  #33048
       Points:  1              |   Reviewer:
      Sponsor:  Sponsor55-can  |
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 In #33222, we added IPv6 ORPort support to inform_testing_reachability().
 But that function checks the ORPorts and DirPort itself, rather than
 logging the reachability checks that were actually launched.

 We'd like to pass flags so that it logs the actual reachability tests that
 are being run. (Rather than re-checking the relay's own routerinfo, which
 may have changed since the most recent reachability checks were launched.)

 But inform_testing_reachability() is called when:
 * the first circuit finishes building, or
 * tor is reconfigured, and some circuits have already finished building.

 So we need to do a bit of a refactor.

 The refactor should preserve this behaviour:
 * don't log until after the first circuit has finished building (rather
 than logging as soon as we start building reachability circuits)

 And introduce this new behaviour:
 * log the ports that were tested recently, rather than the ports that are
 currently available.

 As an alternative, we could move some of the logging into the functions
 that actually launch the checks. And elevate some of those logs to notice
 level.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34137>
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