Cannot access SSL Error

[bartols]

Is not possibile to access to the SSL error in Connect or in Accept, the error is local to template bool ssl_connect_or_accept_nonblocking.
Solutions could be have a "last_res" in client/server class so will be possible to retrieve the ssl error with SSL_get_error(ssl, res), or save a last_ssl_err or expand enum class Error to every possible SSL connect/accept error

[yhirose]

@bartols, since I don't have any necessity to see errors on OpenSSL level and don't have an environment to reproduce your problem, could you send me a pull request to resolve this? Then, I'll review it. Thanks for your help!