Send upstream TAT queries for locally served zones

Send upstream TAT queries for locally served zones

Trying to resolve a trust anchor telemetry query for a locally served
zone does not cause upstream queries to be sent as the response is
determined just by consulting local data.  Work around this issue by
calling dns_view_findzonecut() first in order to determine the NS RRset
for a given domain name and then passing the zone cut found to
dns_resolver_createfetch().

Note that this change only applies to TAT queries generated by the
resolver itself, not to ones received from downstream resolvers.