add Froxlor.generateLoginLink() API call to allow generation of one-time-login links for customers, thx to INWX for supporting and sponsoring this feature

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

lib/Froxlor/Cli/MasterCron.php

@@ -166,6 +166,9 @@ final class MasterCron extends CliCommand
 			FroxlorLogger::getInstanceOf()->setCronLog(0);
 		}
 
+		// clean up possible old login-links
+		Database::query("DELETE FROM `" . TABLE_PANEL_LOGINLINKS . "` WHERE `valid_until` < UNIX_TIMESTAMP()");
+
 		return $result;
 	}