Fix: correct logging paramters and adjust logging level for k8s app

Change-Id: I5882a73420986827921411c8d3cc95d79cd8184a
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNetworkPolicyWatcher.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNetworkPolicyWatcher.java
index 1f8c4a3..311ac8a 100644
--- a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNetworkPolicyWatcher.java
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNetworkPolicyWatcher.java
@@ -161,7 +161,7 @@
 
         @Override
         public void onClose(KubernetesClientException e) {
-            log.info("Network policy watcher OnClose: {}" + e);
+            log.warn("Network policy watcher OnClose", e);
         }
 
         private void processAddition(NetworkPolicy networkPolicy) {