[issue4972] let's equip ftplib.FTP with __enter__ and __exit__

[Giampaolo Rodola']

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

> Is the string returned by a real FTP server “331 username ok”? (My 
> point is that I think it would be better to have different strings for 
> cmd_noop and cmd_user.)

Whoops! No that should have been "200 noop ok". 
I copied cmd_user code and forgot to modify the response string. 
Thanks.

New patch in attachment (I changed the doc a little bit including the "with" example usage in ftplib.rst other than just in what's new).

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Added file: http://bugs.python.org/file17277/ftplib.patch

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