pep8 job is failing because the version of flake8
(flake8<2.7.0,>=2.6.0) requested by hacking<1.2.0 is not
compatible with pyflakes>=2.1.1. Therefore the patch increases
the max version of hacking.
Also the patch fixes a few pep8 errors.
Change-Id: Ib9f1cb5a77947cfb1ab28a7f26e97edba007466c