more info about PKCS#12 structure MAC

report additional information about the MAC used over the
PKCS#12 structure: size of mac and salt as well as the
hash algorithm used for creating it

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1334)