1) Bump hacking max version to 3.0.1 and fix code style failures.
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.
2) Disable swift-proxy service which fails to start on stein. Disabled
other unneeded services while here.
Change-Id: I87c6d037fbbc24ef795ddbe26b5e297fb1bbc7a9
10ef8b76dd