TEST: modify tconversion.pl for forensics

TEST: modify tconversion.pl for forensics

In the interest of finding out what went wrong with a test by looking
at its output, tconversion.pl is modified to take arguments in option
form, and gets an additional -prefix option that callers can use to
ensure output files are uniquely named.

Test recipes are modified to use these new options.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13147)