MINOR: wdt: also consider that waiting in the thread dumper is normal

MINOR: wdt: also consider that waiting in the thread dumper is normal

It happens that upon looping threads the watchdog fires, starts a dump,
and other threads expire their budget while waiting for the other threads
to get dumped and trigger a watchdog event again, adding some confusion
to the traces. With this patch the situation becomes clearer as we export
the list of threads being dumped so that the watchdog can check it before
deciding to trigger. This way such threads in queue for being dumped are
not attempted to be reported in turn.

This should be backported to 2.0 as it helps understand stack traces.