Have imgutil complete the capture process, splitting work
between target and repository.
Provide hook through kcmdline to induce installtodisk.
Have installimage reboot system cleanly when done.
Have new /etc/confluent in cloned system.
Hook for post scripts to execute.
When going to zram, things were solid for space reduction as
data was written, however memory could no longer be reclaimed.
It turns out that zram supports TRIM, and by telling xfs discard,
we have it do trim-on-demand. It is by default off out of performance
concerns, but I don't think that applies to a zram backed filesystem.
