[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3695: Improve error messaging in integration testing

[Tahoe-LAFS]

#3695: Improve error messaging in integration testing
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 Reporter:  maylee   |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  Integration and Unit Testing
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 Some ideas/discussion:
 - One enduser improvement could be to turn off non-useful error messages
 - Some kind of helpful action should be suggested in an error message
 - Sysadmin logging with no error messages (set up new logger and there
 will be at least some improvement at the debug level)
 - Improve non-`Foolscap` logging (use `Eliot`-based logging?)

 @meejah suggests this filter:
 https://github.com/LeastAuthority/magic-
 folder/pull/306/commits/608d38748920fe856a165e9adfab54e9b43f990c

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3695>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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