[QA] Ruby tests updated to Selenium 3

[Željko Filipin]

The majority of migration was without problems. Three repositories still
need to be updated because some tests are failing: MobileFrontend,
RelatedArticles, Wikibase.

This task has all details:

https://phabricator.wikimedia.org/T158074

mediawiki_selenium 1.8.0 release notes document changes.

https://phabricator.wikimedia.org/diffusion/MSEL/browse/master/RELEASES.md

If you have any questions, or you need help upgrading, let me know.

Željko
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