adapt tests to SSL_OP_LEGACY_SERVER_CONNECT change

adapt tests to SSL_OP_LEGACY_SERVER_CONNECT change

The "bad DTLS" tests run into trouble due to the special behavior
for that "bad" version, and the SSL record tests need to set the
-legacy_server_connect flag to allow an SSLv2 ClientHello to work
against any TLS server (since SSLv2 ClientHello messages cannot
carry extensions as would be needed in order to negotiate the use
of the renegitiation_info extension).

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15127)