[issue20505] Remove resolution from selectors and granularity from asyncio

[STINNER Victor]

STINNER Victor added the comment:

Here is clock_resolution.patch: reintroduce the old "granularity" but only use the resolution of the clock (expect the selector to round away from zero).

clock_resolution.patch fixes test_timeout_rounding() on my Windows 7 with HPET enabled, even with my more agressive version of the test (test also sleep close to nanoseconds, not only close to milliseconds).

Maybe we should also fix #20320: round away from zero for select(), kqueue and signal.sigtimedwait().

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Added file: http://bugs.python.org/file34023/clock_resolution.patch

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