Output correct HTTP server port on start

Was outputting NaN, because the property that was being used no longer
existed after previous changes.

* src/server/daemon/Daemon.js (_initHttpServer): Use HTTP port number
  in output.

src/server/daemon/Daemon.js

@@ -536,7 +536,7 @@ module.exports = AbstractClass( 'Daemon',
                 .then( port => this._httpServer.listen( port, () =>
                 {
                     this._debugLog.log(
-                        1, "Server running on port %d", _self._httpPort
+                        1, "Server running on port %d", port
                     );
 
                     callback();