[issue20535] run_tests.py: Work around issues 20355 and 20361

[Roundup Robot]

Roundup Robot added the comment:

New changeset c89e495cdff8 by Serhiy Storchaka in branch '3.3':
Issue #20535: PYTHONWARNING no longer affects the run_tests.py script.
http://hg.python.org/cpython/rev/c89e495cdff8

New changeset 656d0e273ccb by Serhiy Storchaka in branch 'default':
Issue #20535: PYTHONWARNING no longer affects the run_tests.py script.
http://hg.python.org/cpython/rev/656d0e273ccb

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nosy: +python-dev

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<http://bugs.python.org/issue20535>
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