Add support for secDNS-1.1

[kmkaplan]

It would be nice to have support for RFC 5910 Domain Name System Security Extensions Mapping for the Extensible Provisioning Protocol.

Progress

• info,
• create,
• update,

[djc]

I'm unlikely to implement this myself because I don't think the cost/benefit ratio for DNSSEC is net positive, but happy to review if you want to put in the effort.