[issue14407] concurrent.futures tests don't adher to test_cases protocol

[Zachary Ware]

Zachary Ware added the comment:

I had missed this issue before; issue16968 tracks the same thing.

There are a couple of issues that the committed patch doesn't address.  Namely, the file still uses test_main, and there is no thread or process reaping when running the file via discovery.

Unfortunately, there's no clear-cut best solution in the other issue.  A couple months ago, Serhiy posted a question on python-dev[1] about how to solve it, which I haven't seen any replies to.  Antoine, do you have any suggestions?

[1] https://mail.python.org/pipermail/python-dev/2013-August/127893.html

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nosy: +serhiy.storchaka, zach.ware

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