polypath asymmetric routing: Handle MSG2-4 late dupes
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Wed, 15 May 2019 20:59:18 +0000 (21:59 +0100)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Sat, 18 May 2019 01:16:37 +0000 (02:16 +0100)
If we get a MSG2-4 and it seems too late for the protocol stage, and
it had the same nonces, it was probably an old packet via a different
route.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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