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.
DS records. NSEC3 is not disabled.
- fake-sha1 test option; print warning if used. To make unit tests.
git-svn-id: file:///svn/unbound/trunk@4043 be551aaa-1e26-0410-a405-d3ace91eadb9