Use the possibility to have test results in a different directory

Use the possibility to have test results in a different directory

RESULT_D can be used to provide a separate directory for test results.
Let's use that to separate them from other files.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4507)

(cherry picked from commit 41f571e10c31cd58aada3cfde3be6a8a94cea64a)