[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3492: There is a bunch of unnecessary junk in the support code for the deprecations tox env

[Tahoe-LAFS]

#3492: There is a bunch of unnecessary junk in the support code for the
deprecations tox env
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
---------------------+---------------------------
 The tox env sets `PYTHONWARNINGS` and `run-deprecations.py` looks at its
 value so it can decide if it should emit a warning.  Then, the value is
 discarded.  The net effect is nothing.

 Toss this code out.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3492>
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