block: read-only: open cdrom as read-only when using monitor's change command
Current code of monitor command: 'change', used to open file for read-write uncoditionally. Change to open it as read-only for CDROM, and read-write for all others. Signed-off-by: NNaphtali Sprei <nsprei@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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