use config port when calling geth

Author: iurimatias

lib/geth_commands.js

@@ -80,7 +80,7 @@ GethCommands.prototype.mainCommand = function(address) {
 
   cmd += this.commonOptions();
 
-  cmd += "--port " + "30303" + " ";
+  cmd += "--port " + config.port + " ";
   cmd += "--rpc ";
   cmd += "--rpcport " + config.rpcPort + " ";
   cmd += "--rpcaddr " + config.rpcHost + " ";