block: Add bdrv_set_backing_hd()
This is the common but non-trivial steps to assign or change the backing_hd of BDS. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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