[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3448: Convert modules that only reference `unicode` to `str`

[Tahoe-LAFS]

#3448: Convert modules that only reference `unicode` to `str`
------------------------+----------------------------------
 Reporter:  rpatterson  |          Owner:  rpatterson
     Type:  task        |         Status:  new
 Priority:  normal      |      Milestone:  Support Python 3
Component:  code        |        Version:
 Keywords:              |  Launchpad Bug:
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 Modules that reference `unicode` but do **not** reference `str` can safely
 be converted to use `str` in a way that's closest to the way it should be
 done under Python 3 but that is still Python 2 compatible [https://python-
 future.org/compatible_idioms.html?highlight=unicode#unicode per `python-
 future`].

 Identify these modules and make these changes.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3448>
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