adding robocop and fixing up lint for ruby files

* The .rubocop.yaml specifies this projects
  default requirements.
* Globals should be defined in this file.
* specifically exclude any docker or git folder
* exclude bin/scripts/** folder, no ruby should
  be included here.
* update to latest version of serverspec and rspec
  to support patterns and excludes on task.

Change-Id: Ieb86a9c2b1a19174612d13de40ddedbf6680c106