[tor-bugs] #21493 [Core Tor/Tor]: When reachable addresses change, mark connections using those addresses

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#21493: When reachable addresses change, mark connections using those addresses
------------------------------+------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  ipv6
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 When a client's reachable addresses change, we should:
 * close connections that are on newly unreachable addresses,
 * mark connections that are on non-preferred connections as "not for new
 streams".

 This implements user intent faster than the current code (which
 essentially does nothing, and waits for old unreachable connections to die
 naturally, and new reachable connections to replace them).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21493>
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