[issue16910] Fix test discovery for bytes/string tests

[Roundup Robot]

Roundup Robot added the comment:

New changeset 55383912c225 by Ezio Melotti in branch '3.3':
#16910: test_bytes, test_unicode, and test_userstring now work with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/55383912c225

New changeset 6478c4259ce3 by Ezio Melotti in branch 'default':
#16910: merge with 3.3.
http://hg.python.org/cpython/rev/6478c4259ce3

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nosy: +python-dev

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