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. Will
remove the .rubocop-todo.yml once the rest of the Rubocop support is filled out

* updating chefspec to 3.1.4 (for chefspec coverage)

Addresses: blueprint rubocop-for-network
Change-Id: I9c9c5b48f3e1174b1e7ec7b5451a6ad9fd82b5e0
Merge "Filling out initial rubocop support for metadata.rb and the Gemfile."