Don't freak out if trying to close a socket that was already closed.

lib/roles/processor.js

@@ -97,7 +97,10 @@ module.exports = function(options) {
     .handler())
 
   lifecycle.observe(function() {
-    appDealer.close()
-    devDealer.close()
+    try {
+      appDealer.close()
+      devDealer.close()
+    }
+    catch (err) {}
   })
 }