Fix test-order-dependend asyncio test failure caused by rev 909ea8cc86bbab92dbb6231668f403b7360f30fa.
Merge 3.4->default: Fix test-order-dependend asyncio test failure caused by rev 2af5a52b9b87 (in this branch).
Issue #21499: Ignore __builtins__ in several test_importlib.test_api tests.
Merge from 3.4 (for #21499).
Issue #21470: Do a better job seeding the random number generator
to fully cover its state space.
merge