Fix ironic port-create deprecated option

A recent ironicclient commit If05d51b09d787ccfbf6f6d35d8e752d42f673601
deprecated --node_uuid, now it should use --node.

Change-Id: Ia97074bd2ce92645ac4b4151824098cb99434117
diff --git a/lib/ironic b/lib/ironic
index ade889e..0c549b6 100644
--- a/lib/ironic
+++ b/lib/ironic
@@ -600,7 +600,7 @@
             $node_options \
             | grep " uuid " | get_field 2)
 
-        ironic port-create --address $mac_address --node_uuid $node_id
+        ironic port-create --address $mac_address --node $node_id
 
         total_nodes=$((total_nodes+1))
         total_cpus=$((total_cpus+$ironic_node_cpu))