[issue9517] Make test.script_helper more comprehensive, and use it in the test suite

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Having posted that it occurs to me that it could be useful to have the 
> _remove_refcount function in test.support

There's already strip_python_stderr() :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9517>
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