[issue17778] Fix test discovery for test_multiprocessing.py

[Zachary Ware]

Zachary Ware added the comment:

Since there's been another test added since the last version of this patch, here's a new patch again.  I'll also be attaching a patch to 3.3, which includes backports of the 4 changesets mentioned in my last message, as well as the changes for this issue.

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Added file: http://bugs.python.org/file30878/test_multiprocessing_discovery.v3.diff

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