[3.6] bpo-30280: Cleanup threads in ayncio tests (#2501) #2511
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asyncio base TestCase now uses threading_setup() and
threading_cleanup() of test.support to cleanup threads.
bpo-30280: TestBaseSelectorEventLoop of
test.test_asyncio.test_selector_events now correctly closes the event
loop: cleanup its executor to not leak threads.
Don't override the close() method of the event loop, only override
the_close_self_pipe() method.
(cherry picked from commit b903067)