[issue29070] Integration tests for pty.spawn on Linux and all other platforms

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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components:  -Cross-Build
stage:  -> patch review
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29070>
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