[issue16559] Update JSON tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Tests used distorted official testcases for testing non-standard Python json module features. Now it is extracted in separate tests.

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Added file: http://bugs.python.org/file28131/json_tool_tests_2.patch

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<http://bugs.python.org/issue16559>
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