opendd:
 * run /tmp/flash/opendd/opendd.onforcedupdate on a forced update (after 25 days), if exists
 * usefull for dyndns web-login scripts like http://forum.mbremer.de/viewtopic.php?f=62&t=1756&p=24340#p24340
* should be used with onlinechanged together

git-svn-id: file:///var/svn/freetz/trunk@10987 149334a1-2f27-0410-a3b9-fc62619ac1e6