[dns-operations] New subscribers

[Zuleger, Holger, VF-DE]

> We could start a round of intros.

I'm Holger Zuleger, the author of ZKT (http://www.ZoneKeyTool.de), 
a tool for managing DNSSEC zones. ZKT is contributed with BIND since
9.6 (Thank you, Paul).

Regards,
 Holger Zuleger