Configure STUN/TURN

Configures built-in STUN/TURN support, and adds the new service discovery
module for it.

site-cookbooks/kosmos-ejabberd/recipes/default.rb

@@ -200,6 +200,12 @@ unless node.chef_environment == "development"
     protocol :tcp
     command  :allow
   end
+
+  firewall_rule 'ejabberd_stun_turn' do
+    port     3478
+    protocol :udp
+    command  :allow
+  end
 end
 
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