title: Gerrit trigger works manually but not automatically
body: <p>I've configured Jenkins to run a job every time my Gerrit project receives a new commit: 
  Trigger on Patchset created</p>
  
  <p>I'm using the following versions:</p>
  
  <p>Gerrit trigger 2.11.0</p>
  
  <p>Git Client Plugin 1.6.4</p>
  
  <p>Jenkins ver. 1.512</p>
  
  <p>The problem is I can trigger it manually without problems, but the trigger is not running automatically! I tried to move to version Gerrit trigger 2.9.0 to check if this problem is because the update, but I couldn't manage to go back to that version.</p>
  
  <p>Do you have any idea about why auto trigger doesn't work?
  Thanks</p>