Ensure listeners are registered only once #16
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Julusian
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It is possible for the application to re-register the exit-hook listeners many times. This is particularly apparent in unit tests, as they are likely to teardown all the hooks and recreate many times in a row and can cause node to complain about 'Maxeventlisteners exceeded'
Without this fix, the unit test will report that after creating
unsubscribe3there will be 2 listeners forexit.