* 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: Ib41313b5aae991e6ffef2a89dd69e83985bdc36d