CI: Ignore E722 pep8 issues on debian machines
For now, let's ignore E722 (do not use bare except) in the
debian_testing machines that are part of our CI.
Resolves:
https://pagure.io/SSSD/sssd/issue/3605
Reviewed-by: Michal Židek <mzidek@redhat.com>
Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>