message: use Coroutine\Scheduler
diff: @@ -404,8 +404,9 @@ EOF;
  $exitExceptiontMsg;
  $this->startTime = microtime(true);
  - for ($i = 0; $i < $this->nConcurrency; $i++) {
  - go(function () use (&$exitException, &$exitExceptiontMsg){
  + $sch = new Coroutine\Scheduler;
  +
  + $sch->parallel($this->nConcurrency, function() use(&$exitException, &$exitExceptiontMsg) {
  try {
  call_user_func([$this, $this->testMethod]);
  } catch (ExitException $e) {
  @@ -413,10 +414,10 @@ EOF;
  $exitExceptiontMsg = $e->getMessage();
  }
  });
  - }
  + $sch->start();
  +
  $this->beginSendTime = microtime(true);
  $this->connectTime = $this->beginSendTime - $this->startTime;
  - Event::wait();
  if ($exitException) {
  exit($exitExceptiontMsg . PHP_EOL);
  }
  