* Use nightly Fenix variant.
* Run the tests in PR.
* Update visual-metrics scripts to include the similarity metrics.
* Use python3.5 in visual-metrics docker.
* Install wget in the docker.
* Use python3.6 hashes instead of python3.5.
* Undo run-visual-metrics.py python changes.
* Upgrade python setuptools version to 46.1.3.
* Add setuptools to transitive dependency list.
* Undo PR test changes.
* Remove setuptools install line and use requirements.txt instead.
* Undo PR test changes.
* Fix geckodriver artifact suffix.
* Test a browsertime task.
* Revert browsertime test.
