[issue17333] Fix test discovery for test_imaplib.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 02bbc5375a56 by Ezio Melotti in branch '3.3':
#17333: test_imaplib now works with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/02bbc5375a56

New changeset b8bafae4a15a by Ezio Melotti in branch 'default':
#17333: merge with 3.3.
http://hg.python.org/cpython/rev/b8bafae4a15a

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nosy: +python-dev

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<http://bugs.python.org/issue17333>
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