This reverts commit 74317a3445.
What I missed was that "dib-lint" is distributed and people use this
to lint their out-of-tree elements (e.g. project-config). Because
dib-lint runs flake8 that really makes it a valid runtime dependency.
However, I don't think we need to pin to these particular versions of
flake8 in requirements (which I think was causing the original issues,
as it's fairly specific and easily conflicts). It seems to make more
sense to use the current uncapped "hacking" versions; so move them
from test-requirements.txt. Add a note so we don't forget again.
Change-Id: Ic2eee8f5b64c7020e98e0b1ef43a40f24411891a
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