* 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.