[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3511: Support mutating tahoe.cfg via _Config

[Tahoe-LAFS]

#3511: Support mutating tahoe.cfg via _Config
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 For ticket:2916 we want some commands that programmatically rewrite
 tahoe.cfg.

 Add some support infrastructure to _Config to make this easier.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3511>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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