[issue20976] pyflakes: remove unused imports

[Roundup Robot]

Roundup Robot added the comment:

New changeset d308c20bf2f4 by R David Murray in branch 'default':
Merge #20976: remove unneeded quopri import in email.utils.
http://hg.python.org/cpython/rev/d308c20bf2f4

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<http://bugs.python.org/issue20976>
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