Fix flaky TaskPool.finish() unittest. #636
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The disabled test is for existing finish() behavior. The new behavior still has coverage.
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Fix intermittent failure on std.parallelism related to recent change for Issue 8214.
I haven't been able to reproduce the problem, but from reading code there was obvious race condition. After last task completes there is a minute time before work loop attempts to pop next task, sees there are no more, and sets TaskPool state to stopped.