Added SSL related fields to access.log

Added three fields to access log:
- SSL version, for instance 'TLSv1/SSLv3'.
- SSL cipher suite, for instance 'ECDHE-RSA-AES128-GCM-SHA256'
- SSL session reused.
This would return cipher's version like **TLSv1/SSLv3** or **SSLv2**. For SSL protocol version , I think it would be better to use SSL_get_version.