AclWalker deprecation

[dannyvw]

User Deprecated: Your output walker class Kunstmaan\AdminBundle\Helper\Security\Acl\AclWalker should implement Doctrine\ORM\Query\OutputWalker in order to provide a Doctrine\ORM\Query\Exec\SqlFinalizer. This also means the output walker should not use the query firstResult/maxResult values, which should be read from the query by the SqlFinalizer only. (Query.php:827 called by Query.php:264, doctrine/orm#11188, package doctrine/orm)