[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3618: Enable -bb for all Python 3 ported tests

[Tahoe-LAFS]

#3618: Enable -bb for all Python 3 ported tests
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 Reporter:  itamarst  |          Owner:  itamarst
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  Support Python 3
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
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 The -bb flag for Python catches errors with string formatting on Python 3,
 specifically `"%s" % (b"bytes",)`. We should enable this for all tests.

 I've already done `allmydata.test.web`, and hopefully should be possible
 to do the rest of the tests in one PR.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3618>
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