Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/apache2/recipes/mod_proxy_html.rb

@@ -1,25 +0,0 @@
-#
-# Cookbook:: apache2
-# Recipe:: mod_proxy_html
-#
-# Copyright:: 2013, OneHealth Solutions, Inc.
-# Copyright:: 2015, Alexander van Zoest
-#
-# 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.
-#
-
-if node['apache']['version'] != '2.4' && node['platform_family'] == 'debian'
-  package 'libapache2-mod-proxy-html'
-end
-
-apache_module 'proxy_html'