[tor-bugs] #33195 [Core Tor/Tor]: Require IPv6 tests in Travis CI

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#33195: Require IPv6 tests in Travis CI
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     Reporter:  teor            |      Owner:  teor
         Type:  task            |     Status:  assigned
     Priority:  Medium          |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:  tor-ci, chutney
Actual Points:                  |  Parent ID:  #33194
       Points:  0.1             |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 While we're actively changing our IPv6 code, we should make sure that the
 macOS chutney IPv6 tests pass in Travis CI.

 While I'm doing this change, I will see if there are:
 * some redundant jobs I can delete, or
 * some inactive areas that I can make fast_finish.

 I think our Rust build might be a good candidate for fast_finish, we
 haven't changed that code much in about a year. But I should check with
 the team before making this change.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33195>
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