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

[Giampaolo Rodola']

Giampaolo Rodola' <billiejoex at users.sourceforge.net> added the comment:

After Bill added SSL's unwrap() method I modified my previous patch so
that it shutdown the SSL layer before closing the data connection.
I successfully tested it against proftpd, vsftpd and pyftpdlib TLS
server [1].

If some python developer could give me an ok on the patch I could start
writing tests and documentation.

[1] http://code.google.com/p/pyftpdlib/source/browse/trunk/demo/tls_ftpd.py

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keywords: +patch
Added file: http://bugs.python.org/file13156/ftplib.patch

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