asyncio, Tulip issue 105: in debug mode, log callbacks taking more than 100 ms
to be executed.
Issue #21768: fix type in test_pydoc, patch by Claudiu Popa.
Issue #21768: fix NameError in test_pydescr. Patch by Claudiu Popa.
Issue #21491: socketserver: Fix a race condition in child processes reaping.
Issue #21770: Call function instead of module. Patch by Claudiu Popa.
Fix test_pydoc failure introduced by 7aa72075d440. Patch by Berker Peksag.
Merge.