[issue19705] Update test.test_namespace_pkgs to PEP 451

[Brett Cannon]

New submission from Brett Cannon:

There is nothing to update; the tests work through the import statement directly.

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dependencies:  -Merge all (non-syntactic) import-related tests into test_importlib
resolution:  -> invalid
status: open -> closed

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<http://bugs.python.org/issue19705>
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