Update requirements.
o This required the regular updates to .pylintrc and various changes
in the source code to pass the new linter checks.
o This updates to the new setuptools
o This upgrades to the new pytest-datafiles 3.0 API
This required many changes to tests, the new API is however
a bit simpler to work with, and now preserves file permissions
staged into the test location.
Especially:
o artifact_list_contents.py: Expect different results now that
the hello script is executable.
o completions.py: Update cache keys. This is not a cache key break,
but upgrading pytest-datafiles causes the artifact used in the
`bst artifact log` completion test to be legitimately different.
o This required limiting the indirect isort dependency in dev-requirements
since the latest version is not available for Python 3.7
41 files changed
