Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/apache2/templates/default/mods/proxy.conf.erb

@@ -1,23 +0,0 @@
-<IfModule mod_proxy.c>
-  #turning ProxyRequests on and allowing proxying from all may allow
-  #spammers to use your proxy to send email.
-
-  ProxyRequests Off
-
-  <Proxy *>
-    AddDefaultCharset off
-  <% if node['apache']['version'] == "2.4" -%>
-    Require <%= node['apache']['proxy']['require'] %>
-  <% else -%>
-    Order <%= node['apache']['proxy']['order'] %>
-    Deny from <%= node['apache']['proxy']['deny_from'] %>
-    Allow from <%= node['apache']['proxy']['allow_from'] %>
-  <% end -%>
-  </Proxy>
-
-  # Enable/disable the handling of HTTP/1.1 "Via:" headers.
-  # ("Full" adds the server version; "Block" removes all outgoing Via: headers)
-  # Set to one of: Off | On | Full | Block
-
-  ProxyVia On
-</IfModule>