[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           |     Resolution:
 Keywords:  tor-ci, chutney  |  Actual Points:
Parent ID:  #33050           |         Points:  0.1
 Reviewer:                   |        Sponsor:  Sponsor55-must
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Comment (by teor):

 We need to merge the #33075 backport, before making these changes.

 We can delete the following redundant jobs:
 * Linux clang distcheck
   * I think this job was actually an 0.2.9 merge forward error

 We need to speed up the macOS chutney IPv6 job, because it runs for 23-46
 minutes:
 * run IPv4-only in Linux, and IPv6-only in macOS

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33195#comment:3>
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