[issue2054] add ftp-tls support to ftplib - RFC 4217

[Bill Janssen]

Bill Janssen <bill.janssen at gmail.com> added the comment:

The 2.6/3.0 changes are now up-to-date.  We could reconsider this
problem.  My guess is that we still don't quite know what to do.

I think the issue is that we need a way to "unwrap" the SSL-secured
TCP stream, after it's been used.  So we need to expose the SSL
shutdown mechanism (already in the _ssl.c module) in the Python
code.  Something like

   socket = self.unwrap()

which would return a plain socket.socket instance.

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