title: "classes" parallel in TestNG test suite doesn't work when executing the suite in TestNG Ant task
body: <p>I set up Selenium grid2 and it works well with following paralleled TestNG test suite:</p>
  
  <pre><code>&lt;!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" &gt;
      &lt;suite name="Sample Test Suite" parallel="classes" thread-count="2"&gt;
      &lt;test name="Test in Chrome" preserve-order="true"&gt;
          &lt;parameter name="browser" value="chrome" /&gt;
          &lt;classes&gt;
              &lt;class name="testCases.SampleCase1" /&gt;
              &lt;class name="testCases.SampleCase2" /&gt;
          &lt;/classes&gt;
      &lt;/test&gt;
  &lt;/suite&gt;
  </code></pre>
  
  <p>But the parallel doesn't work any more when I execute the tests in TestNG Ant task.</p>
  
  <p>And it works again after I change the parallel mode in the test suite file with "tests" as below:</p>
  
  <pre><code>&lt;!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" &gt;
  
  &lt;suite name="Sample Test Suite" parallel="tests" thread-count="2"&gt;
      &lt;test name="Test1 in Chrome" preserve-order="true"&gt;
          &lt;parameter name="browser" value="chrome" /&gt;
          &lt;classes&gt;
              &lt;class name="testCases.SampleCase1" /&gt;
          &lt;/classes&gt;
      &lt;/test&gt;
      &lt;test name="Test2 in Chrome" preserve-order="true"&gt;
          &lt;parameter name="browser" value="chrome" /&gt;
          &lt;classes&gt;
              &lt;class name="testCases.SampleCase2" /&gt;
          &lt;/classes&gt;
      &lt;/test&gt;
  &lt;/suite&gt;
  </code></pre>
  
  <p>So does that mean TestNG ant task doesn't support "classes" paralleled test suite?</p>