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

[fidencio]

   URL: https://github.com/SSSD/sssd/pull/379
Author: fidencio
 Title: #379: CI: Enable pep8 check
Action: synchronized

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