Comment 1 for bug 1300483

The original root cause is "| tee" in the following line:
https://github.com/stackforge/fuel-web/blob/64b5e4ef552a00c81ec74567df3657a4249ac145/run_tests.sh#L187

This causes the "tee" exit code to overwrite exit code of nosetests, so run_nailgun_tests() never returns error.