[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3362: Add a CI check for tab literals in .py files

[Tahoe-LAFS]

#3362: Add a CI check for tab literals in .py files
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 Reporter:  chadwhitacre        |          Owner:
     Type:  task                |         Status:  new
 Priority:  normal              |      Milestone:  Support Python 3
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
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 Acceptance

 1. CI fails if there are tab literals in .py files.
 1. Any existing tab literals in .py files are converted to four spaces.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3362>
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