vmdk: Implement .bdrv_has_zero_init
Depending on the subformat, has_zero_init queries underlying storage for flat extent. If it has a flat extent and its underlying storage doesn't have zero init, return 0. Otherwise return 1. Aligns the operator assignments. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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