* 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
a13295b9a8