qemu-iotests: add tests for rebasing zero clusters
If zero clusters are erroneously treated as unallocated, "qemu-img rebase" will copy the backing file's contents onto the cluster. The bug existed also in image streaming, but since the root cause was in qcow2's is_allocated implementation it is enough to test it with qemu-img. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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tests/qemu-iotests/050
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tests/qemu-iotests/050.out
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