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

[Christie]

Christie added the comment:

@r.david.murray and @flipmcf:

I've audited all test modules using sys.executable for a starting point, and these tests look like they could benefit from helper methods to invoke python (probably the ones in script_helper, but we may want to create others if the use cases don’t quite fit):
* _test_multiprocessing.py
* test_base64.py
* test_capi.py - some of this looks legitimate, but some of it could maybe benefit from the helpers
* test_cmd_line.py
* test_faulthandler.py
* test_file_eintr.py
* test_gc.py
* test_keyword.py
* test_pdb.py
* test_popen.py
* test_quopri.py
* test_site.py
* test_source_encoding.py
* test_sys.py
* test_sysconfig.py
* test_tcl.py - something complex is going on in here, not sure if it’s necessary or not
* test_threading.py
* test_pindent.py
* test_traceback.py
* test_unicodedata.py
* test_json/test_tool.py

@r.david.murray I'm going to start with test_unicodedata.py for a nice easy starting point so I'll create a separate issue for it.

@flipmcf should I start using your patch set as-is or is there more to come?

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