add TCP_NODELAY option
improve error message in illformated unknown record type, thanks Jelte for reporting
implement RKEY record type. No regression test since none have ever been spotted in the wild, so we don't know what to compare against.
SRV record can have a '.' as final field, from which we would dutifully strip the trailing ., leaving void, confusing everything. We now remove the trailing . in the right place, and not if we are trying to server '.'. Again thanks to Jelte & SIDN for catching this.
fix error in test description
add new test for SRV records pointing at ., fix error within zoneparser that got confused by such root records
enable us to do SRV records that end on . for zone2sql
update ent-axfr test with _root SRV test
fix nsec3 and nsec3-optout tests too for ent-axfr
and fix up tinydns tests