[issue8324] add a distutils test command

[Dan Buch]

Dan Buch <daniel.buch at gmail.com> added the comment:

@merwok I know ;-)  ... should I assume that it's an installation requirement a la `install_requires=['unittest2']`, or do::

    try:
        load_tests_with_unittest2()
    except ImportError:
        load_tests_with_custom_test_loader()

?

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<http://bugs.python.org/issue8324>
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