Do not vendor cookbooks using Berkshelf anymore

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

.chef/config.rb

@@ -0,0 +1,19 @@
+current_dir = File.dirname(__FILE__)
+
+cookbook_path             ["#{current_dir}/../site-cookbooks"]
+node_path                 "nodes"
+role_path                 "roles"
+environment_path          "environments"
+data_bag_path             "data_bags"
+encrypted_data_bag_secret "#{current_dir}/encrypted_data_bag_secret"
+local_mode                true # Chef local mode, replacing Solo
+chef_zero.enabled true
+
+cookbook_copyright     'Kosmos'
+cookbook_license       'none'
+cookbook_email         'mail@kosmos.org'
+
+# Enable knife-solo's Berkshelf integration
+knife[:berkshelf] = true
+# Set Chef version installed by `knife solo prepare`
+knife[:bootstrap_version] = "14.11.21"