[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2935: properly validate config

[Tahoe-LAFS]

#2935: properly validate config
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 Reporter:  meejah   |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  1.12.1
 Keywords:           |  Launchpad Bug:
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 completely unknown configuration items should be rejected (at least).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2935>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage