Github user velo commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/209#issuecomment-186490946
The way it was before, I would see intermittent errors on windows.
AwaitTermination will "Blocks until all tasks have completed execution
after a shutdown request, or the timeout occurs, or the current thread is
interrupted, whichever happens first."
So, it will either return after timeout or well all finish.
Them it runs a forcefully shutdown.
That way this tests become stable either here or in the appveyor.
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