Thanks for the feedback, Robie! I believe the underlying problem was this 
kernel bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1628336

The /dev/nbd0p1, etc, partition devices were never getting creating
automatically after connecting the device, no matter how long you
waited. So you had to call partprobe, whereas on Xenial and older you
didn't.

And you bring up some good points about my scripts being fragile unless
I do some sort of polling or using inotify (although in practice I
haven't had problems with this).

But I agree this shouldn't really be treated as a bug, should be marked
invalid.

Thanks again!

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https://bugs.launchpad.net/bugs/1630341

Title:
  yakkety: behavior change in `qemu-nbd -c $DEV $FILENAME`: doesn't
  automatically create partion devices

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