title: Duplicate checkstyle warnings in a jenkins maven multimodule job
body: <p>I have a jenkins maven job with an aggregator pom and a bunch of submodules. When jenkins displays the checkstyle warnings it does it like so:</p>
  
  <ul>
  <li>submodule 1: 10 warnings</li>
  <li>submodule 2: 10 warnings</li>
  <li><p>Aggregator module: 20 warnings</p></li>
  <li><p>Total: 40 warnins</p></li>
  </ul>
  
  <p>In other words, the aggregator (rightfully?) aggregates the warnings found in the submodules, which wouldn't be such a big problem if it weren't because the <em>total</em> then becomes double what it should be.</p>
  
  <p>Does any one know what the problem is? Thanks!</p>