test: fix alpn tests for openssl1.0.2h

https://github.com/openssl/openssl/commit/af2db04c9979554ada88d969da6332a827a47599
changed some ALPN behaviors. The tests when ALPN has no selection
should be fixed because openssl was changed NPN callback to be invoked
in this case.

Fixes: https://github.com/nodejs/node/issues/6458
PR-URL: https://github.com/nodejs/node/pull/6550


Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>