This means we need to pass 'now' into dns_adb_findaddrinfo() as well, to filter
out timers that have expired.

be caught properly in createfind()

Preliminary support for the "target" attribute of the adbname, to be used
for CNAME/DNAME chains later on.
The resolver will now do appropriate findzonecut calls, so the ADB need
not concern itself with them any more.
Fix some bugs in NXDOMAIN/NXRRSET handling.

Handle the NXDOMAIN and NXRRSET cases, so we don't start fetches for
data we're authoritative for.

as a general purpose minimum ttl, and actually set the TTL to the minimum
when re get a negative cache entry.

in adb.c

OSs.  It may remain (but not in the present form) since storing ipv6
addresses in the adb makes little sense if you can't use them...

Set a default TTL for type 3 negative cache elements.  This is local to
the ADB, and cannot leak to clients, so no specs are violated.

Change a logging level to be less verbose.

ncache responses from fetches and database lookups correctly now, but
there needs to be a little more cleanup here and there.  Bugs exist.