For now, only the following two directories will be linted:
python/mozlint
tools/lint
New directories can be added by adding them to the 'include'
directive in tools/lint/flake8.lint. They all default to the
configuration specified in topsrcdir/.flake8. Subdirectories
can override this configuration by creating their own .flake8
file.
MozReview-Commit-ID: Eag48Lnkp3l