[issue6001] Test discovery for unittest

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

The usage information in TestProgram in this patch is not correct. 

If __name__ != __main__ it should be unchanged - the new usage message
should only be displayed if unittest is run as __main__.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6001>
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