[SSSD] [sssd PR#379][opened] CI: Enable pep8 check

URL: https://github.com/SSSD/sssd/pull/379 Author: fidencio Title: #379: CI: Enable pep8 check Action: opened PR body: """ As said by the commit log, this PR enables pep8 check in our CI. I really would appreciate to hear @lslebodn's feedback on the patch itself, so I can revisit the commit dropped by @jhrozek that fixes all pep8 warnings and have it added to this series. Anyways, the feedback I'm looking for is basically: Is this patch desired? Is this the right approach? If not, what would you suggest? """ To pull the PR as Git branch: git remote add ghsssd https://github.com/SSSD/sssd git fetch ghsssd pull/379/head:pr379 git checkout pr379