zabbix:
 * bump version to [http://www.zabbix.com/rn2.2.6.php 2.2.6] (by MyRaCoLi)
 * fixes #2542


git-svn-id: file:///var/svn/freetz/trunk@12403 149334a1-2f27-0410-a3b9-fc62619ac1e6