Add user account ID to warning email

resources/RemoveInactiveUsersRunner.php

@@ -70,6 +70,7 @@ function deleteUser($user, $em){
 
 function sendWarningEmail($user){
     $userEmail = $user->getEmail();
+    $accountId = $user->getCertificateDn();
 
     // Email content
     $headers = "From: no-reply@goc.egi.eu";
@@ -79,7 +80,7 @@ function sendWarningEmail($user){
     $localInfoXML = simplexml_load_file ( $localInfoLocation );
     $webPortalURL = $localInfoXML->local_info->web_portal_url;
 
-    $body = "Dear GOCDB User,\n\n" . "Your account has not signed in for the past 17 months and is due for deletion in 30 days.\n\n" .
+    $body = "Dear GOCDB User,\n\n" . "Your account (ID:". $accountId .") has not signed in for the past 17 months and is due for deletion in 30 days.\n\n" .
             "You can prevent this by simply signing in at:\n\n" . $webPortalURL . "\n\n";
 
     // Handle all mail related printing/debugging