Add spec coverage for rbenv_global resource.
Add spec coverage for rbenv_global resource.

sous-chefs/ruby_rbenv,pollosp/ruby_rbenv,chef-rbenv/ruby_rbenv,dexpetkovic/ruby_rbenv,chef-rbenv/ruby_rbenv,pollosp/ruby_rbenv,sous-chefs/ruby_rbenv,chef-rbenv/ruby_rbenv,pollosp/ruby_rbenv,dexpetkovic/ruby_rbenv,dexpetkovic/ruby_rbenv