When we are talking to an upstream nameserver we should not refuse to

    forward queries for certain reverse zones (e.g. RFC1918 space). The
    local network might use them and it's the policy of the upstream
    nameserver what should be done with these.

    Of course if we are recursively resolving ourselves these should not
    leak to the global internet so we continue to synthesize NXDOMAIN
    ourselves.

    For now we also always synthesize NXDOMAIN for special use domains like
    test and onion.

    Pointed out by henning.
    Input & OK sthen

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