TESTS: Fix E305 pep8 issues on pyhbac-test.py
E305: expected 2 blank lines after class or function definition, found 1
This issue was found on a debian_testing machine.
Resolves:
https://pagure.io/SSSD/sssd/issue/3605
Reviewed-by: Michal Židek <mzidek@redhat.com>
Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>