send TLS alert on handshake failure when recent versions of OpenSSL is used #1872
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It has turned out that H2O has stopped sending TLS alerts upon handshake failure, when a recent version of OpenSSL is being used (the issue known to happen in 1.1.0g, but not in 1.1.0d). See
#1865 (comment) for how it happens.
This PR brushes up the fix proposed in #1865 as well as adding a test.