Implement the NULL cipher in the default provider

Implement the NULL cipher in the default provider

Libssl uses the null cipher in certain situations. It should be
converted to a provided cipher.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10865)