Migration of browsertests* Jenkins jobs to selenium* jobs
selenium* jobs are a new way of running Ruby based Selenium tests. The
jobs are triggered daily.
- Gemfile now specifies version of gems
- added Rake gem to Gemfile
- mediawiki_selenium gem updated to 1.7.0
- added selenium target from mediawiki_selenium 1.7.0 to Rakefile
- created a basic ci.yml file
- updated config.yml and environments.yml with values for beta cluster
- replaced WB_REPO_PASSWORD environment variable with MEDIAWIKI_PASSWORD
- fixed env.rb so it works with selenium Rake target
Bug: T128190
Change-Id: I0db4dc0b96d8d8c4e61cfa9cbf7f59472e0f7fe2