log_generator unauth tests incorrect

[Peter Stachowski]

The two log_generator tests 'test_log_generator_unauth_user' and 'test_log_generator_publish_unauth_user' are coded incorrectly. There is a raise inside of a try/except block, which will never propagate outside the test case.

See: https://github.com/openstack/trove/blob/master/trove/tests/scenario/runners/guest_log_runners.py#L358

[Peter Stachowski (peterstac)]

Even when changing the test to 'assertraises' it still fails, so something else must be going on ...