3fe89808c6
The repo is Python 3 now, so update hacking to version 3.0 which supports Python 3. Fix problems found. Update local hacking checks for new flake8. Remove hacking and friends from lower-constraints, they are not needed to be installed at run-time. Fix flake8wrap to take arguments from tox.ini and not look at .tox directory. Change-Id: I1c5f5a85af02d9f11e475b6088fe1d9d9d252083