* don't use CRYPTO_LOCK stuff (they are sorted out by openssl, and no
application intervention is required, just like boringSSL)
* don't use OPENSSL_config
* use provided API to access BIO member
Compile with BoringSSL except for neverbleed and libnghttp2_asio. The
former uses ENGINE and RSA_METHOD, and they are quite different
between OpenSSL and BoringSSL. The latter uses boost::asio, which
calls OpenSSL functions deleted in BoringSSL.
This commit add following 3 log variables to SSL/TLS connection:
$ssl_cipher, $ssl_protocol, $ssl_session_id. If no information is
available for them, '-' is produced for each.
Tatsuhiro Tsujikawa
Jay Satiro