title: default_target_path does not work with FOSUserBundle
body: <p>I have installed <code>FOSUserBundle</code> and I am using it in my project. Its login page redirects to an unknown path <code>/_wdt/50366043f414d</code>. I changed the <code>default_target_path</code> under <code>form_login</code> in <code>security.yml</code> file, but it did not take effect.</p>
  
  <p>How can I change the target path of the login page in FOSUserBundle?</p>