[issue22173] Update lib2to3.tests and test_lib2to3 to use test discovery

[Zachary Ware]

Changes by Zachary Ware <zachary.ware at gmail.com>:


Removed file: http://bugs.python.org/file36310/test_lib2to3_discovery.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22173>
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