[issue8513] subprocess: support bytes program name (POSIX)

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Ok, everything is ready for this issue: os.environb and os.fsencode() are commited, and test_os is prepared to test os._execvpe() change. I'm just waiting for a review.

Execpt the change on os.get_exec_path(), the patch is now simple.

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keywords: +needs review

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<http://bugs.python.org/issue8513>
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