Fix exit code for VMS in util/wrap.pl and test/run_tests.pl

Fix exit code for VMS in util/wrap.pl and test/run_tests.pl

The exit code for VMS is a bit tricky, and while perl translates the
VMS status code from a typical C program to posix terms, it doesn't
automatically translate its exit code into the typical C program VMS
status code.  Perl scripts are recommended to do so explicitly.

Therefore, we make util/wrap.pl and test/run_tests.pl simulate the
typical C program VMS status code for all non-zero exit codes, except
we give them all the error severity (according to the VMS C library
reference manual, exit codes 2 and above are treated as success...).

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15787)