Filling out initial rubocop support for metadata.rb and the Gemfile.

https://blueprints.launchpad.net/openstack-chef/+spec/lint-and-unit-testing-for-havana
Removing tailor, cleaning up metadata and Gemfile and adding TESTING.md

Addresses: blueprint rubocop-for-object-storage
Change-Id: Ib5eb85cb179638a3336b3b6add9a2556505ec48a
Merge "Filling out initial rubocop support for metadata.rb and the Gemfile."