[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3253: refactor and consolodate "Fake" classes

[Tahoe-LAFS]

#3253: refactor and consolodate "Fake" classes
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 Reporter:  meejah  |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:  soon
Component:  code    |        Version:  1.13.0
 Keywords:  tests   |  Launchpad Bug:
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 Many of the existing "unit" tests have custom "Fake" objects. There are,
 for example, eight `FakeClient` classes declared in various test modules.

 These should be made into a single, proper fake that can be used in all
 these situations. Similar for other classes with "Fake" in the name.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3253>
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