Don't wait for dry at the end of a handshake
For DTLS/SCTP we were waiting for a dry event during the call to tls_finish_handshake(). This function just tidies up various internal things, and after it completes the handshake is over. I can find no good reason for waiting for a dry event here, and nothing in RFC6083 suggests to me that we should need to. More importantly though it seems to be wrong. It is perfectly possible for a peer to send app data/alerts/new handshake while we are still cleaning up our handshake. If this happens then we will never get the dry event and so we cannot continue. Reviewed-by:Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5084)
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