logging: haproxy -> /var/log/haproxy.log
pep8: Exclude vendored plugins, known bad files
pep8: remove unknown config option builtins
Merge pull request #546 from blueboxgroup/pep8-exclude

pep8: Exclude vendored plugins, known bad files
Merge pull request #540 from blueboxgroup/haproxy-logging

logging: haproxy to /var/log/haproxy.log