[issue15358] Test pkgutil.walk_packages in test_pkgutil instead of test_runpy

[Chris Jerdonek]

Changes by Chris Jerdonek <chris.jerdonek at gmail.com>:


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dependencies: +Refactor the create-package code in test_runpy into a helper module

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15358>
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