[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3745: Remove vestigial `whitelist_externals` from Tox configuration

[Tahoe-LAFS]

#3745: Remove vestigial `whitelist_externals` from Tox configuration
--------------------------------+---------------------------
 Reporter:  sajith              |          Owner:
     Type:  defect              |         Status:  new
 Priority:  normal              |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
--------------------------------+---------------------------
 There are a few stray `whitelist_externals = mv` directives left in
 `tox.ini`:


 {{{
 [testenv:codechecks3]
 basepython = python3
 ...
 whitelist_externals =
          /bin/mv
 ...
 [testenv:draftnews]
 ...
 whitelist_externals = mv
 ...
 [testenv:news]
 ...
 whitelist_externals =
     mv
 ...
 }}}

 This was needed in older revisions of `tox.ini` (prior to fixing #3730),
 when towncrier configuration file used to be renamed inside the
 environment (with `mv towncrier.pyproject.toml pyproject.toml`) prior to
 running towncrier, and then renamed back (with `mv pyproject.toml
 towncrier.pyproject.toml`).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3745>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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