TEST: Optionally silence OpenSSL::Test::setup()

TEST: Optionally silence OpenSSL::Test::setup()

test/generate_ssl_tests.pl uses OpenSSL::Test to get to some of its
practical location functions.  A recent note in the setup() code made
its result not quite match the original (we do check that), so there's
a need to silence setup(), which we do with a simple optional argument.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11080)