Make ULS+commons Jenkins job green

Run only tests that pass. Workaround for hook that executes twice and
causes tests to fail.

Job URL:
https://wmf.ci.cloudbees.com/view/r-uls/job/UniversalLanguageSelector-co
mmons.wikimedia.beta.wmflabs.org-linux-firefox/

Change-Id: I43161b66b07880c54baa1c5748c96176b41c1daa