qemu: snapshot: Allow snapshots of read-only disks when we can create them
With -blockdev or when reusing externally created images and thus without the need for formatting the image we actually can support snapshots of read-only disks. Arguably it's not very useful so they are not done by default but users of libvirt such as oVirt are actually using this. https://bugzilla.redhat.com/show_bug.cgi?id=1832204Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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