[issue12139] Add CCC command support to ftplib

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

The culprit here is the dummy FTP test server which does not complete the SSL shutdown procedure successfully.

I believe it's better if we remove the self.client.sendcmd('noop') line.

That's there in order to check that client and server can still "talk" after reverting the connection back to clear-text, but making the server doing this right is quite complicated, see for example:
http://code.google.com/p/pyftpdlib/source/browse/trunk/pyftpdlib/contrib/handlers.py?spec=svn868&r=861#196

I don't want to include and maintain that monster into test_ftplib.py so I think I'll just remove that line from the tests.

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<http://bugs.python.org/issue12139>
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