Fix rbac_rule_validation test being incorrectly skipped

Unit tests should not be skipped. Currently, however, the test
test_invalid_policy_rule_throws_parsing_exception is being skipped,
because after strict_policy_check was introduced [0], a skip
exception is thrown (when strict_policy_check is False, which it
is by default), instead of an "actual" exception.

Thus, the test was being skipped incorrectly.

This patch fixes that by overriding strict_policy_check in
the test to be True.

[0] https://review.openstack.org/#/c/449340/

Change-Id: I95b4150ebaf729ff8d0e1569ba591b8275779aa8
1 file changed