Fix QDnsLookup autotest failure in CI environment

Fix QDnsLookup autotest failure in CI environment

The DNS server can legitimately include NS and A records for
the authoritative name server in addition to the DNS records
that were requested.
These are now ignored when checking the reply (we only check
results that match the query, rather than failing if a result
is for a different host name than the query).

Task-number: QTBUG-24698
Change-Id: I327f31d58cdca50c7df6b32b275d7f28b56405f0
Reviewed-by: Jeremy Lainé <jeremy.laine@m4x.org>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>