Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/postfix/templates/default/access.erb

@@ -1,9 +0,0 @@
-#
-# Auto-generated by Chef. Do not hand edit!
-# Local modifications will be overwritten.
-#
-# See man 5 access for format
-
-<% node['postfix']['access'].each do |name, value| %>
-<%= name %> <%= value %>
-<% end unless node['postfix']['access'].nil? %>