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

[Giampaolo Rodola']

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

If we want to add SSL support then the patch in attachment modifies the 
last one as I described in my previous comment.
I re-run the tests and they are ok so I guess you can go on with the 
commit.

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Added file: http://bugs.python.org/file15343/ftplib.patch

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