[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3297: Deprecations CI job fails

[Tahoe-LAFS]

#3297: Deprecations CI job fails
---------------------------+---------------------------
 Reporter:  exarkun        |          Owner:
     Type:  defect         |         Status:  new
 Priority:  supercritical  |      Milestone:  undecided
Component:  unknown        |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
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 {{{
 Collecting git+https://github.com/twisted/twisted
   Cloning https://github.com/twisted/twisted to /tmp/pip-req-build-3aDKKI
   Running command git clone -q https://github.com/twisted/twisted /tmp
 /pip-req-build-3aDKKI
   Installing build dependencies: started
   Installing build dependencies: finished with status 'done'
   Getting requirements to build wheel: started
   Getting requirements to build wheel: finished with status 'done'
   Installing backend dependencies: started
   Installing backend dependencies: finished with status 'done'
     Preparing wheel metadata: started
     Preparing wheel metadata: finished with status 'done'
 ERROR: Package u'Twisted' requires a different Python: 2.7.13 not in
 '>=3.5'
 }}}

 It looks like this is caused by the attempt to install Twisted trunk at HEAD
 in order to get early warning about use of newly deprecated Twisted APIs.
 However, Twisted has recently completely dropped Python 2.7 support so
 trunk at HEAD is no longer usable with Tahoe-LAFS.

 This turns CI red.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3297>
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