[gnutls-devel] GnuTLS | Listening DTLS server responds with HELLO_VERIFY_REQUEST to most messages (#632)

[Development of GNU's TLS library]

Hi. The problem is definitely in the server application. More specifically, in [udp-serv.c](https://gitlab.com/gnutls/gnutls/blob/master/src/udp-serv.c#L112), if the cookie is invalid, which it is for any non-CLIENT_HELLO message, then a HELLO_VERIFY_REQUEST message is constructed. A simple fix would be checking that the what is received is in fact a CLIENT_HELLO message. 

I am working on a reproducer, it's been a long time since I last programmed in C, so it should be interesting.

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