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Fix a crash when dig or host receive a signal

Tony Finch requested to merge 3970-dighost-signal-crash into main

When the loopmanager is shutting down following a signal, dig and host should stop cleanly. Before this commit they were oblivious to ISC_R_SHUTTINGDOWN.

The isc_signal callbacks now report this kind of mistake with a stack backtrace.

Closes #3970 (closed)

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