fixing recursive deletion of domains

Summary:
recursive deletion: need to find and delete objects with objectclass ldapsubentry as well (#5100).
This is for example needed when deleting a domain, for the role kolab-admin which has class ldapsubentry

Reviewers: vanmeeuwen, #web_administration_panel_developers

Reviewed By: vanmeeuwen, #web_administration_panel_developers

Subscribers: machniak, vanmeeuwen

Differential Revision: https://git.kolab.org/D23

lib/Net/LDAP3.php

@@ -665,7 +665,7 @@ class Net_LDAP3
     public function delete_entry_recursive($entry_dn)
     {
         // searching for sub entries, but not scope sub, just one level
-        $result = $this->search($entry_dn, '(objectclass=*)', 'one');
+        $result = $this->search($entry_dn, '(|(objectclass=*)(objectclass=ldapsubentry))', 'one');
         if ($result) {
             $entries = $result->entries(true);