Stop DTLS servers asking for unsafe legacy renegotiation
If a DTLS client that does not support secure renegotiation connects to an OpenSSL DTLS server then, by default, renegotiation is disabled. If a server application attempts to initiate a renegotiation then OpenSSL is supposed to prevent this. However due to a discrepancy between the TLS and DTLS code, the server sends a HelloRequest anyway in DTLS. This is not a security concern because the handshake will still fail later in the process when the client responds with a ClientHello. Reviewed-by: Tim Hudson <tjh@openssl.org> (cherry picked from commit d40ec4ab)
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