This turns completely empty responses, a type of noerror/nodata into
a servfail, but they do not conform to RFC2308, and the retry can
fetch improved content.
This makes validated to be insecure data just as worthless as
nonvalidated data, and 2181 rules prevent cache overwrites to them.
- Fix assertion fail on bogus key handling.
- dnssec lameness detection works on first query at trust apex.
- NS queries get proper cache and dnssec lameness treatment.
- fixup compilation without pthreads on linux.
- NS queries are done after every referral.
validator is used on those NS records (if anchors enabled).
git-svn-id: file:///svn/unbound/trunk@1185 be551aaa-1e26-0410-a405-d3ace91eadb9
