[3.8] bpo-38546: multiprocessing tests stop the resource tracker (GH-17641) #17647
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Multiprocessing and concurrent.futures tests now stop the resource
tracker process when tests complete.
Add ResourceTracker._stop() method to
multiprocessing.resource_tracker.
Add _cleanup_tests() helper function to multiprocessing.util: share
code between multiprocessing and concurrent.futures tests.
(cherry picked from commit 9707e8e)
https://bugs.python.org/issue38546