Andreas Jaeger 2e3d8ab80d Update hacking for Python3
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.

# to unbreak gate:
Depends-on: https://review.opendev.org/715835

Change-Id: Icc2f4368cc90689d74510ce36fe77d2346aec625
2020-04-01 21:52:38 +00:00
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