stop continually resends signals during shutdowns

Since our :QUIT and :TERM signal handlers are idempotent, we can
safely retry sending signals in case workers don't/can't handle
them them the first time around.  This appears to be a problem
with the Thread-based concurrency models in Rainbows! not
behaving well (no surprise, though, since pthreads and signals
are difficult to manage/mix properly).

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