OpenSSL::Test: Avoid running IPv6 related tests if IPv6 was explicitly disabled

OpenSSL::Test: Avoid running IPv6 related tests if IPv6 was explicitly disabled

It's possible to disable IPv6  explicitly when configuring OpenSSL.  In that
case, IPv6 related tests should be skipped.

This is solved by having OpenSSL::Test::Utils::have_IPv6() check configuration
first, before trying to determine if the machine supports IPv6.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24748)

(cherry picked from commit 5a9c90b1e59b2c368876229862fbff29f2bcf006)