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Change-Id: Ic8a7001e708d8da7cf8951eefd0a96762ea5fa46
The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.
Fix problems found.
Update local hacking checks to work with new flake8 version.
Change-Id: Id5d224358b44fd7ab4bd3d08f1db6b6faf54042f