In the interest of conforming to the de-facto coding standard for
OpenStack projects, this patch enables all checks for flake8 and
hacking, plus fixes everything reported.
Also, several docstrings were edited for clarity and grammar.
Change-Id: If85c4e420811b6df8eb55de1b5f07a0a8acfceff
Implements: blueprint grizzly-debt
a556f392c5