kubevirt / containerized-data-importer / 4794

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Restore sparse images as the default (revert #970) (#1140)

(Leaving in some of the checks introduced in that change)

Having sparse disks works better with external storage being
monitored for low capacity. If we allocate the full size at
start, it shows up as a disk capacity alert immediately.

Another motivation to pre-allocate was that cloning would
sometimes fail for capacity reasons.
We now validate available size before cloning, so we don't
expect that problem to return.

Signed-off-by: Maya Rashish <mrashish@redhat.com>

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