If the option is specified it will now implicitly enable peer verification.

The s_client command  was already behaved this way, so
s_server was updated to match the behavior of s_client.

Fixes #15134

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28445)