[issue20964] Add support.check_time_delta()

[STINNER Victor]

New submission from STINNER Victor:

Follow-up of issue #20910: add a support.check_time_delta() function an a --check-time-delta command line option for Lib/test/regrtest.py. By default, the function tolerate a difference of 500 ms for the maximum delta.

The idea is to set the --check-time-delta option on slowest buildbots to tolerate larger difference.

For example, test_time_and_call_at() of test_asyncio takes 2000 ms instead of 100 ms on the "AMD64 OpenIndiana 3.x" buildbot:
http://bugs.python.org/issue20336#msg208714

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components: Tests
files: check_time_delta.patch
keywords: patch
messages: 213914
nosy: haypo
priority: normal
severity: normal
status: open
title: Add support.check_time_delta()
versions: Python 3.5
Added file: http://bugs.python.org/file34471/check_time_delta.patch

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<http://bugs.python.org/issue20964>
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