(legacy/vpn) add syslog facilities to legacy vpn.inc

(cherry picked from commit 9297c0e0)

src/etc/inc/plugins.inc.d/vpn.inc

@@ -90,6 +90,19 @@ function vpn_services()
     return $services;
 }
 
+/**
+ * request syslog facilities for this plugin
+ * @return array
+ */
+function vpn_syslog()
+{
+    $logfacilities = array();
+    $logfacilities['pptps'] = array("facility" => array('pptps'), "remote" => null);
+    $logfacilities['poes'] = array("facility" => array('poes'), "remote" => null);
+    $logfacilities['l2tps'] = array("facility" => array('l2tps'), "remote" => null);
+    return $logfacilities;
+}
+
 function vpn_pptpd_configure()
 {
   global $config;