Rather than simply waiting silently and indefinitely for all

interrupt-driven configuration handlers to complete, print out a
diagnostic message every 60 second indicating which handlers are
still running.  Do this at most 5 times per run so as to avoid
scrolling out any useful information from the kernel message
buffer.

The interval of 60 seconds was selected based on a best guess as
to the nature of "long enough" and may want to be tuned higher
or lower depending on real-world tolerances.

MFC after:	3 days
Discussed with:	scottl

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