[issue15064] Use context manager protocol for more multiprocessing types

[Dan O'Reilly]

Dan O'Reilly added the comment:

It's probably too late to do anything about this now, but wouldn't it make more sense for `Pool.__exit__` to call `close`, rather than `terminate`? The vast majority of the time, that's probably what the user of the `Pool` would want to run. It also would make the behavior consistent with `concurrent.futures.ProcessPoolExecutor`, which will always wait for pending tasks to complete before exiting the `with` block.

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nosy: +dan.oreilly

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15064>
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