block: Open by reference will try device then node_name.
Since we introduced node_name for named bs of the graph modify the opening by reference to use it as a fallback. This patch also enforce the separation of the device id and graph node namespaces. Signed-off-by: NBenoit Canet <benoit@irqsave.net> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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