Spec change to deal with pylint issues

Sounds like katello cli has issues with pylint 1.0 which comes with f19.
Going to file a issue to fix the pylint suggested changes, but for now
sticking with the pylint the version that we use for f18 and rhel 6. We
should try to fix this in the future
Merge pull request #115 from parthaa/pylint-patch

Spec change to deal with pylint issues