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* Add hacking to the tox build - a set of flake8 plugins that perform automatic validation of many HACKING.rst rules. * This patch configures hacking in the tox build and performs the mechanical cleanup required to allow the checks to pass. * See https://pypi.python.org/pypi/hacking Change-Id: Ie9b3eb5627a9b6dd181f79225abae422e6cf3777