Vendor the external cookbooks

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

cookbooks/postfix/templates/default/relay_restrictions.erb

@@ -0,0 +1,10 @@
+#
+# Auto-generated by Chef.
+# Local modifications will be overwritten.
+#
+# Attribute name is the domain name, Attribute value is either OK or REJECT
+
+<% node['postfix']['relay_restrictions'].each do |name, value| %>
+<%= name %> <%= value %>
+<% end unless node['postfix']['relay_restrictions'].nil? %>
+*			REJECT