Check DTLS_BAD_VER for version number.

The version check for DTLS1_VERSION was redundant as
DTLS1_VERSION > TLS1_1_VERSION, however we do need to
check for DTLS1_BAD_VER for compatibility.

PR:2984
(cherry picked from commit d980abb22e22661e98e5cee33d760ab0c7584ecc)