Don't freak out on double stop.

lib/roles/auth/mock.js

@@ -19,6 +19,9 @@ module.exports = function(options) {
   lifecycle.observe(function() {
     log.info('Waiting for client connections to end')
     return server.closeAsync()
+      .catch(function(err) {
+        // Okay
+      })
   })
 
   app.set('view engine', 'jade')