Add rbenv-ruby 2.2.2 to CI machines.
Add rbenv-ruby 2.2.2 to CI machines.

Includes fix for
https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/

alphagov/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet,boffbowsh/ci-puppet,boffbowsh/ci-puppet,boffbowsh/ci-puppet,boffbowsh/ci-puppet