[issue11404] support /dev/null for subprocess.call() and friends

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


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resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> subprocess.DEVNULL

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11404>
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