test_timeout_rounding() pass on all major buildbots. test_asyncio hangs on fails on some buildbots, but there are dedicated issues (like #20495 and #20600).

I'm closing this one. I reopened the rounding issue for select and kqueue, please help me to close this last issue! #20505

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For the record, some debug info on Windows:

AMD64 Windows7 SP1 3.x:

asyncio: IocpProactor.select(10.0000 ms) took 6.764 ms (monotonic=15.000 ms, clock res=15.600 ms)
asyncio: SelectSelector.select(100.0000 ms) took 97.473 ms (monotonic=109.000 ms, clock res=15.600 ms)

asyncio: SelectSelector.select(100.0000 ms) took 97.397 ms (monotonic=109.000 ms, clock res=15.600 ms)
asyncio: SelectSelector.select(0.9998 us) took 32.643 us (monotonic=0.000 us, clock res=15600.100 us)
asyncio: SelectSelector.select(0.0098 us) took 28.419 us (monotonic=0.000 us, clock res=15600.100 us)

x86 Windows Server 2003 [SB] 3.x:

asyncio: IocpProactor.select(100.0000 ms) took 96.972 ms (monotonic=110.000 ms, clock res=15.625 ms)
asyncio: IocpProactor.select(10.0000 ms) took 8.663 ms (monotonic=16.000 ms, clock res=15.625 ms)

asyncio: SelectSelector.select(100.0000 ms) took 98.644 ms (monotonic=110.000 ms, clock res=15.625 ms)
asyncio: SelectSelector.select(10.0000 ms) took 5.911 ms (monotonic=16.000 ms, clock res=15.625 ms)
asyncio: SelectSelector.select(0.9998 us) took 75.635 us (monotonic=0.000 us, clock res=15625.000 us)
asyncio: SelectSelector.select(0.0098 us) took 74.903 us (monotonic=0.000 us, clock res=15625.000 us)

AMD64 Windows Server 2008 [SB] 3.x:

asyncio: IocpProactor.select(100.0000 ms) took 95.484 ms (monotonic=109.000 ms, clock res=15.600 ms)
asyncio: IocpProactor.select(10.0000 ms) took 1.819 ms (monotonic=15.000 ms, clock res=15.600 ms)

asyncio: SelectSelector.select(100.0000 ms) took 97.741 ms (monotonic=109.000 ms, clock res=15.600 ms)
asyncio: SelectSelector.select(10.0000 ms) took 1.536 ms (monotonic=16.000 ms, clock res=15.600 ms)
asyncio: SelectSelector.select(0.0100 us) took 46.560 us (monotonic=0.000 us, clock res=15600.100 us)
asyncio: SelectSelector.select(0.0001 us) took 46.080 us (monotonic=0.000 us, clock res=15600.100 us)