[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4048: Fix the `cli_options.stdout` pattern

[Tahoe-LAFS]

#4048: Fix the `cli_options.stdout` pattern
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 In tor_provider and i2p_provider, https://github.com/tahoe-lafs/tahoe-
 lafs/pull/1283 introduced a couple type ignore comments to suppress the
 mypy error now present in those places due to new type annotations.  The
 error complains about `Options` having no `stdout` attribute.  It's true
 the type doesn't generally, but `runner.py` puts one there.

 Instead of dynamically adding extra attributes to `Options`, the code
 should either pass stdout (and stderr I think?) separately or introduce a
 new type specifically for representing an options value and some more
 stuff.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4048>
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