[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3702: Port all codechecks to Python 3

[Tahoe-LAFS]

#3702: Port all codechecks to Python 3
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 Reporter:  itamarst  |          Owner:
     Type:  task      |         Status:  new
 Priority:  normal    |      Milestone:  Support Python 3
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
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 Tox has a a `codechecks` section that runs flake8, a variety of scripts,
 checking things like whitespace, news file being present, towncrier, and
 the like.

 While we should continue to run flake8 on both Python 2 and 3 until Python
 2 is dropped, all other checks should run on Python 3 only.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3702>
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