commands: fix parameter value output

commands: fix parameter value output

The parameter value output library routine was incorrect.  It used the
incorrect length when printing fetched parameter sizes.  It also printed
a string which was potentially not zero terminated.  Both of these are
addressed here.

Additionally, octet strings have their initial bytes printed in hex.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27221)