[issue32972] unittest.TestCase coroutine support

[John Andersen]

New submission from John Andersen <johnandersenpdx at gmail.com>:

This makes unittest TestCase classes run `test_` methods which are async

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components: Tests, asyncio
messages: 313063
nosy: asvetlov, pdxjohnny, yselivanov
priority: normal
pull_requests: 5708
severity: normal
status: open
title: unittest.TestCase coroutine support
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32972>
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