[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2989: Many Node-creating tests leak a tempfile mutation

[Tahoe-LAFS]

#2989: Many Node-creating tests leak a tempfile mutation
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  1.12.1
 Keywords:           |  Launchpad Bug:
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 Creating a node mutates `tempfile.tempdir` to control the location of
 temporary files during node operation.

 The test suite creates many nodes and also runs code that creates
 temporary files that don't belong in the per-node temporary directory.

 This mutation should be cleaned up after each test.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2989>
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