pyhbac-test: Do not use assertEquals
src/tests/pyhbac-test.py:163: DeprecationWarning: Please use assertEqual instead.
self.assertEquals(el.__repr__(), u'<category 0 names [] groups []>')
src/tests/pyhbac-test.py:169: DeprecationWarning: Please use assertEqual instead.
u'<category 1 names [foo] groups [bar, baz]>')
Merges: https://pagure.io/SSSD/sssd/pull-request/3927
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>