Change favicon of test details page based on test result
As a test reviewer or test developer I would like to see from the favicon in a browser tab the status of a job to be able to not waste time by switching to the tab to check the test result
- AC1: the test details favicon reflects the state/status of the test, e.g. scheduled, running, passed, failed
Inspired what travis CI or github has, see
okurz: I personally favor the approach from github because we would not have a problem with the already green openQA default icon and it does not rely on being able to distinguish colors, i.e. also works for color impaired people.