Add support for TLS "Server Name Indication" (SNI)

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http://en.wikipedia.org/wiki/Server_Name_Indication

Per 
http://stackoverflow.com/questions/5113333/how-to-implement-server-name-indicati
onsni-on-openssl-in-c-or-c:

On the client side, you use SSL_set_tlsext_host_name(ssl, servername) before 
initiating the SSL connection.

On the server side, it's a little more complicated:
•Set up an additional SSL_CTX() for each different certificate;
•Add a servername callback to each SSL_CTX() using 
SSL_CTX_set_tlsext_servername_callback();
•In the callback, retrieve the client-supplied servername with 
SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name). Figure out the right 
SSL_CTX to go with that host name, then switch the SSL object to that SSL_CTX 
with SSL_set_SSL_CTX().

Original issue reported on code.google.com by gambit47 on 7 May 2014 at 6:01

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Original comment by gambit47 on 15 Nov 2014 at 10:55

• Changed state: Started