[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3412: Many tests are flaky

[Tahoe-LAFS]

#3412: Many tests are flaky
-------------------------+------------------------------
     Reporter:  jaraco   |      Owner:  jaraco
         Type:  defect   |     Status:  assigned
     Priority:  normal   |  Milestone:  Support Python 3
    Component:  unknown  |    Version:  n/a
   Resolution:           |   Keywords:
Launchpad Bug:           |
-------------------------+------------------------------
Description changed by jaraco:

Old description:

> As observed in [[https://app.circleci.com/pipelines/github/tahoe-lafs
> /tahoe-lafs/803/workflows/5d9c7811-0f9a-
> 4c33-8a12-07d1c20714bd/jobs/28462|this run]], part of a PR that doesn't
> change any code, the `test_POST_upload_replace` fails twice, once with a
> `twisted.web.error` and another with a `KeyError`.
>
> In [[https://app.circleci.com/pipelines/github/tahoe-lafs/tahoe-
> lafs/806/workflows/32a32357-63ef-41b0-ab32-fbc10971ddd3/jobs/28503|this
> build]], `allmydata.test.test_system.SystemTest` fails with a `FailTest`.

New description:

 As observed in [[https://app.circleci.com/pipelines/github/tahoe-lafs
 /tahoe-lafs/803/workflows/5d9c7811-0f9a-
 4c33-8a12-07d1c20714bd/jobs/28462|this run]], part of a PR that doesn't
 change any code, the `test_POST_upload_replace` fails twice, once with a
 `twisted.web.error` and another with a `KeyError`.

 In [[https://app.circleci.com/pipelines/github/tahoe-lafs/tahoe-
 lafs/806/workflows/32a32357-63ef-41b0-ab32-fbc10971ddd3/jobs/28503|this
 build]], `allmydata.test.test_system.SystemTest` fails with a `FailTest`.

 [[https://app.circleci.com/pipelines/github/tahoe-lafs/tahoe-
 lafs/808/workflows/71b9035e-0cba-418b-9b41-83f9af1c63ab/jobs/28538|this
 run]] reveals that `test_filesystem` is flaky.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3412#comment:5>
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