(legacy) add util.inc to helper scripts

src/etc/inc/openvpn.attributes.php

@@ -25,6 +25,7 @@
         ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
         POSSIBILITY OF SUCH DAMAGE.
 */
+require_once("util.inc");
 
 if (empty($common_name)) {
 	$common_name = getenv("common_name");

src/etc/inc/openvpn.auth-user.php

@@ -37,6 +37,7 @@
 require_once("config.inc");
 require_once("radius.inc");
 require_once("auth.inc");
+require_once("util.inc");
 require_once("interfaces.inc");
 
 /**