Summary:
Simple tools, based on D19664298, that use the JSON report to enable py2 only tests for py3 testing, and revert the changes to those tests that fail.
update-successes.py is just xavierd's original code
Use as needed to enable tests on py3 after debugging, A recommended workflow is in the test plan
Reviewed By: singhsrb
Differential Revision: D19670838
fbshipit-source-id: fc525941cb010c9038c1f73d89913420e0c79981
