Given special semantics of ZFS it's far from clear what the expected
result is. Just skip it for now

LVM miscalculates bitmap size with small extent, so start with 16K as
for other RAID types.

Until version 2.02.103 LVM counts metadata segments twice when checking
available space, reduce segment count by one to account for this bug.

LVM mirror defaults to RAID1 today and can be different on different
systems as set in lvm.conf.

Write activity with LVM/RAID can happen after filesystem is unmounted.
In my testing modification time of loop files was 15 - 20 seconds
after unmount.  So use time as close to unmount as possible as
reference instead.

This fixes bug that system would become unbootable after ext*
online resize if no resize_inode was created at ext* format time.

than hardcoding /usr/local/bin/xorriso.

	quite some time locally. Most of the test require root so they are
	skipped when run without necessarry privelegies.