[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2266: remove unused deterministic RNG code in TestMixin

[Tahoe-LAFS]

#2266: remove unused deterministic RNG code in TestMixin
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 Reporter:  daira          |          Owner:
     Type:  defect         |         Status:  new
 Priority:  minor          |      Milestone:  soon
Component:  code           |        Version:  1.10.0
 Keywords:  cleanup tests  |  Launchpad Bug:
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 In [ticket:1852#comment:14], zooko said:
 > [...] the other thing the
 [source:trunk/src/allmydata/test/common_util.py?annotate=blame&rev=884685278b4d558b8eb38af2a1800948bc6d3aef#L114
 TestMixin] does replaces {{{os.urandom}}} with a deterministic RNG in
 order to make tests more reproducible. It isn't currently used, so let's
 remove that functionality.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2266>
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