[issue17933] test_ftp failure / ftplib error formatting issue

[Rock Lee]

Rock Lee added the comment:

yes, the malformed server could do evil things.  If we need to cover this situation, we need to some extra fixes in this file. 

Maybe the exception message look like this is the better one ?
   ftplib.error_perm: 550 Failed to change directory

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17933>
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