[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
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 Reporter:  teor    |          Owner:  teor
     Type:  defect  |         Status:  needs_review
 Priority:  Medium  |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor     |        Version:
 Severity:  Normal  |     Resolution:
 Keywords:  ipv6    |  Actual Points:
Parent ID:  #17811  |         Points:
  Sponsor:          |
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Comment (by teor):

 I pushed two further commits to feature17840-v11 for bridge clients:
 * Bridge clients should get directory documents via IPv6 (#17963)
 * Bridge clients should respect fascist firewall and ClientUseIPv4
   * This commit preserves the existing bridge client preference for IPv6
 addresses

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17840#comment:7>
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