Add new kubernetes node state, add a set of state related REST APIs

Change-Id: I2ac3d9ff26030433e61148e0bf8963016f751f8a
diff --git a/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DefaultK8sNodeHandler.java b/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DefaultK8sNodeHandler.java
index 1c68f3d..a64b772 100644
--- a/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DefaultK8sNodeHandler.java
+++ b/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DefaultK8sNodeHandler.java
@@ -255,6 +255,11 @@
         // do something if needed
     }
 
+    @Override
+    public void processPostOnBoardState(K8sNode k8sNode) {
+        // do something if needed
+    }
+
     /**
      * Extracts properties from the component configuration context.
      *