[issue11049] add tests for test.support

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

This changeset incorporates Giampaolo's patch with a minor fix in `test.support.python_is_optimized` (which returned '' for False sometimes).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11049>
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