[issue17304] Fix test discovery for test_hash.py

[Roundup Robot]

New submission from Roundup Robot:

New changeset 619ed4ed7087 by Ezio Melotti in branch '3.3':
#17304: test_hash now works with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/619ed4ed7087

New changeset bc4458493024 by Ezio Melotti in branch 'default':
#17304: merge with 3.3.
http://hg.python.org/cpython/rev/bc4458493024

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17304>
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