Make cipher_kt_name always return normalised cipher name

Make cipher_kt_name always return normalised cipher name

The mbed TLS variant of the call already returned the normalised
name while the OpenSSL variant did not. On top of that, all calls but
one to cipher_kt_name were translate_cipher_name_to_openvpn. This commit
moves the call of translate_cipher_name_to_openvpn into cipher_kt_name
or avoids calling it twice in the case of mbed TLS.

The one case that did not translate_cipher_name_to_openvpn is an
internal ssl_openssl.c method that should call EVP_CIPHER_name anyway.

Also simplify cipher_name_cmp function that is only used by
openvpn --show-ciphers with the modified cipher_kt_name
function.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Steffan Karger <steffan@karger.me>
Message-Id: <20200605112519.22714-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19970.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>