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

[Christie]

Christie added the comment:

@serhiy.storchaka - just double checking, do you guys need me to make any more changes to the patch?

And is there any more review needed, or is it possible for this to be merged?

Thanks very much!

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<http://bugs.python.org/issue9517>
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