Simon Kelley 71766c0c35 Tweak handling of duplicate DNS answers via UDP.
If we get a duplicate answer for a query via UDP which we have
either already received and started DNSSEC validation, or was
truncated and we've passed to TCP, then just ignore it.

The code was already in place, but had evolved wonky and
only worked for error replies which would otherwise prompt
a retransmit.
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