qemu-iotests/081: Avoid blockdev-add with id

We want to remove the 'id' option for blockdev-add. This removes one
user of the option and makes it use only node names.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/qemu-iotests/081

@@ -119,7 +119,7 @@ run_qemu <<EOF
     "arguments": {
         "options": {
             "driver": "quorum",
-            "id": "drive0-quorum",
+            "node-name": "drive0-quorum",
             "vote-threshold": 2,
             "children": [
                 {