zabbix update

[Andrew Pantyukhin]

I decided to try zabbix out and had to update the port:
http://people.freebsd.org/~sat/diffs/zabbix113.diff

There are still a few todo items, like pgsql 8.1 schema
patch.

It seems that Sergey has been inactive for quite a while,
though he did surface this October. If neither he, nor
anyone else knowledgeable of zabbix, wish to maintain
it, I'll consider taking it.

Thanks!