Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/postfix/templates/default/maps.erb

@@ -0,0 +1,8 @@
+#
+# This file is generated by Chef.
+# Local changes will be overwritten
+#
+
+<% @map.each do |key, value| -%>
+<%= key %><%= @separator %><%= value %>
+<% end unless @map.nil? -%>