Fixes bug #574 (http://bugs.zpanelcp.com/view.php?id=574) the default SOA record is now set as ns1.{yourdomain}.{ext}. This was a very good point picked up by 5050, I've check several sites of all which state that the SOA record should be a nameserver and therefore makes sense that we set this as ns1.{yourdomain}.{com} as opposed to the TLD.