Fix race condition in test#214
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This test has been intermittently failing recently both for PRs and master. The original process sometimes manages to terminate the spawned process right after it calls
event.set(), so it never gets totime.sleep(5)yielding less than the expected 100% coverage. I think this 0.5 second wait should be enough for the spawned process to always hit thewaitstatement without slowing the test down perceptibly. I tried 0.1 seconds first, but the pypy tests still failed in Travis with that.