qemu-img: Fix qemu-img can't create qcow image based on read-only image
Commit 03cbdac7 "Disable fall-back to read-only when cannot open drive's file for read-write" result in read-only image can't be used as backed image in qemu-img. Cc: Naphtali Sprei <nsprei@redhat.com> Signed-off-by: NSheng Yang <sheng@linux.intel.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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