[Patch] Fix blocking DTLS

[Sean Buckheister]

Hi,

investigating blocking DTLS handshake failure, I found that they fail
because the server will interpret a retransmitted Finished packet from
the client just as it would treat a Hello, and spuriosly initiates
rehandshake. Only handling the Hello packets in this manner fixes that,
and now all dtls-stress handshake sequences pass (with appropriate
timeouts for such an adversarial network).

Patch is attached.

 -- Sean
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