[issue21741] Convert most of the test suite to using unittest.main()

[Raymond Hettinger]

Raymond Hettinger added the comment:

There are a couple things I really like about this idea:

* In the past, we've had cases of TestXXX classes being omitted, so chunks of the test suite weren't being run.  You patch will fix that and let test discovery "just work".

* The code is shorter, more idiomatic, and matches the way most users of unittest run their code.

I've added a number of stakeholders to the nosy list so they will have a chance to chime in.

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nosy: +brett.cannon, michael.foord, rhettinger
versions:  -Python 3.4

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