Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/hostname/Rakefile

@@ -1,15 +0,0 @@
-require 'foodcritic'
-require 'rspec/core/rake_task'
-require 'rubocop/rake_task'
-
-RuboCop::RakeTask.new(:rubocop)
-
-FoodCritic::Rake::LintTask.new do |t|
-  t.options = {
-    fail_tags: ['any']
-  }
-end
-
-RSpec::Core::RakeTask.new(:spec)
-
-task default: %w[foodcritic rubocop spec]