Use multi-threaded task queues to prevent deadlocks in the case where a

tasks sleeps and expects to be woken up by a task that will be submitted
to the same task queue.  That scenario happens in the output hotplug code.

We probably should spend some time on tuning the number of threads but
let's make things work correctly first.

Based on some serious debugging done by Sven M. Hallberg.

ok jsg@

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