Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/chef-sugar/recipes/default.rb

@@ -1,34 +0,0 @@
-#
-# Cookbook Name:: chef-sugar
-# Recipe:: default
-#
-# Copyright 2013-2015, Seth Vargo <sethvargo@gmail.com>
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-gem_version = run_context.cookbook_collection[cookbook_name].metadata.version
-
-if Chef::Resource::ChefGem.instance_methods(false).include?(:compile_time)
-  chef_gem 'chef-sugar' do
-    version gem_version
-    compile_time true
-  end
-else
-  chef_gem 'chef-sugar' do
-    version gem_version
-    action :nothing
-  end.run_action(:install)
-end
-
-require 'chef/sugar'