Add node IP attribute in k8s node class with minor code refactoring

Change-Id: I4c1c86c95acfeb38569b91c1677e4ce8af90460f
diff --git a/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/K8sNodeManagerTest.java b/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/K8sNodeManagerTest.java
index 0bb0258..e336164 100644
--- a/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/K8sNodeManagerTest.java
+++ b/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/K8sNodeManagerTest.java
@@ -360,6 +360,7 @@
                 .tunBridge(tunBridge.id())
                 .managementIp(ipAddr)
                 .dataIp(ipAddr)
+                .nodeIp(ipAddr)
                 .state(state)
                 .build();
     }