[getdns-api] OPT Record fields

[Goyal, Neel]

Section 4.1 of the spec states that Resource Records have the following fields: type, class, ttl, and rdata.  The OPT record is one of those weird ones where class is interpreted as a udp payload size, and ttl is actually broken up into extended rcode, version, z, and do bit.

I propose we call out that the OPT RR will not have ttl and class, and instead be replaced with the following fields:

  *   udp_payload_size
  *   extended_rcode
  *   version
  *   do
  *   z

type, rdata_raw, and options are already called out in the spec and are valid fields.

Thoughts?


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