Fix SSL_read: unexpected eof while reading issues

[ahrechushkin]

Ignore unexpected shutdown of TLS connections. After updating to ssl 3.0 some requests may fail with unexpected eof while reading issue.

[rhenium]

OpenSSL::SSL::OP_IGNORE_UNEXPECTED_EOF is not a safe option to enable by default.

You can safely set this option in your program, through OpenSSL::SSL::SSLContext#options= or OpenSSL::SSL::SSLContext#set_params, if you know that your protocol can detect a truncation attack (e.g., HTTP/2).