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Return empty response and NOERROR for AAAA record queries for DNS names for which we have an A record. This is to allow for callers that might be first sending an AAAA query and then, if that does not return a response, follow with an A record query. Previously we were returning NOTIMPL that caused some callers to potentially not follow with an A record query or misbehave in different ways. Also return NXDOMAIN for AAAA record queries for names that we DO NOT have an A record for to ensure that the callers do not follow up with an A record query. Returning an empty response and NOERROR is the behaviour that RFC 4074 recommends: https://datatracker.ietf.org/doc/html/rfc4074 Updates tailscale/tailscale#12321 Signed-off-by: Irbe Krumina <irbe@tailscale.com>