conf: Add support of zero-detection for disks
This option allows or disallows detection of zero-writes if it is set to
"on" or "off", respectively. It can be also set to "unmap" in which
case it will try discarding that part of image based on the value of the
"discard" option.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>
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