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

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#33195: Require IPv6 tests in Travis CI
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.4.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  consider-backport-immediately, tor-  |  Actual Points:  0.7
  ci, chutney, ipv6                              |
Parent ID:  #33050                               |         Points:  0.1
 Reviewer:  nickm                                |        Sponsor:
                                                 |  Sponsor55-must
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Comment (by teor):

 I just compared master and this PR:
 * https://travis-ci.org/torproject/tor/builds/650218289
 * https://travis-ci.org/torproject/tor/builds/650232465

 Both finish in about 18 minutes, the IPv6-only tests take 12 minutes on
 macOS.

 I think that's a win, because we:
 * added a slow chutney job (25-45 minutes), but made it faster (13
 minutes), and
 * deleted a redundant distcheck job (8 minutes),
 but kept the same CI wall clock run time.

 (The extra 5 minutes for the chutney job is hidden by the parallelism.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33195#comment:9>
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