[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:  needs_review
 Priority:  High                     |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor                      |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  ipv6, TorCoreTeam201601  |  Actual Points:
Parent ID:  #17811                   |         Points:
  Sponsor:                           |
-------------------------------------+------------------------------------
Changes (by teor):

 * status:  needs_revision => needs_review


Comment:

 Ugh, sorry about that, see feature17840-v11-squashed.

 There were some minor merge conflicts when I attempted a merge to master,
 please see the merge commit in feature17840-v11-merged for the resolution
 of these merge conflicts.

 Please also see feature17840-v11-merged for the options_validate unit
 tests for ClientUseIPv4, ClientUseIPv6, ClientPreferIPv6ORPort and
 ClientPreferIPv6DirPort.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17840#comment:17>
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