[tor-bugs] #27859 [Core Tor/Tor]: update travis CI to ubuntu xenial image when available

[Tor Bug Tracker & Wiki]

#27859: update travis CI to ubuntu xenial image when available
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 Reporter:  cyberpunks    |          Owner:  (none)
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-ci        |  Actual Points:
Parent ID:  #27858        |         Points:
 Reviewer:                |        Sponsor:
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Comment (by cyberpunks):

 Blocked on https://github.com/travis-ci/travis-ci/issues/5821

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27859#comment:1>
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