Update dn in create hook

[davidcoutadeur]

Fixes #299

[davidcoutadeur]

Still missing: add some code samples

[coudot]

Tested with success. Here is a sample code:

<?php

function addCollectiviteInDN($dn, $attributes) {

        require_once("../conf/config.inc.php");
        error_log("DN $dn");
        error_log("CONFIG $ldap_base");
        $attributes['description'] = array("Test HOOK");
        $attributes["uid"][0] = $attributes["uid"][0] ."@test";
        $new_dn = preg_replace('/uid=([^,]+),(.*)/', 'uid=${1}@test,$2', $dn);
        return array(0, "description added", $new_dn, $attributes);
}

?>

Should be cleaned if used in documentation