Renegotiation support

[hph86]

Do you think it is possible to add support for (client-initiated) renegotiation to flextls? This would allow pySSLScan detect both, secure and insecure client-initiated renegotiation support. Currently, pySSLScan cannot detect insecure client-initiated renegotiation support if the server supports secure renegotiations. This is due to the fact that pySSLScan relies on the system's OpenSSL library which then defaults to secure renegotiation.