[tor-bugs] #17840 [Tor]: Add a minimal implementation of ClientUseIPv4 so IPv6-only clients can bootstrap

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#17840: Add a minimal implementation of ClientUseIPv4 so IPv6-only clients can
bootstrap
--------------------+------------------------------------
 Reporter:  teor    |          Owner:  teor
     Type:  defect  |         Status:  accepted
 Priority:  Medium  |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor     |        Version:
 Severity:  Normal  |     Resolution:
 Keywords:  ipv6    |  Actual Points:
Parent ID:  #17811  |         Points:
  Sponsor:          |
--------------------+------------------------------------
Changes (by teor):

 * owner:   => teor
 * status:  new => accepted


Comment:

 My WIP branch here is feature17840-v2, it depends on the changes in
 #17327, it implements the changes in #9067 and #17834, and the majority of
 #9068.

 It turns out that my initial design was over-complicated. Functions
 already exist that select relays and filter them by address. I just needed
 to modify them to check the IPv6 address as well.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17840#comment:1>
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