[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:  High                     |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor                      |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  ipv6, TorCoreTeam201602  |  Actual Points:
Parent ID:  #17811                   |         Points:
  Sponsor:                           |
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Comment (by teor):

 I updated feature17840-v11-squashed and feature17840-v11-merged-v2 with
 one final commit that preserves the previous bridge client behaviour (I
 got it wrong the first time):
 * bridge clients prefer the configured bridge ORPort address when
 ClientPreferIPv6ORPort is auto (the default);
 * otherwise, bridge clients prefer ORPort addresses based on
 ClientPreferIPv6ORPort;
 * other clients prefer IPv4 ORPorts when ClientPreferIPv6ORPort is auto
 (the default);
 * all clients prefer IPv4 DirPorts when ClientPreferIPv6DirPort is auto
 (the default).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17840#comment:21>
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