iotests: Test post-backing convert target behavior
This adds a test case to 122 for what happens when you convert to a target with a backing file that is shorter than the target, and the image format does not support efficient zero writes (as is the case with qcow2 v2). Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20180501165750.19242-3-mreitz@redhat.com Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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