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.

PR-URL: https://github.com/nodejs/node/pull/6552


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Shigeki Ohtsu <ohtsu@iij.ad.jp>