Bumpup kubernetes client from 4.7.1 to 5.0.0 (support up to kubernetes 1.19)

Change-Id: I7555325fd5eee5bbbb7a0a7a5c27bfc2c333fc7f
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 3ded560..12fd6a1 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
@@ -15,10 +15,10 @@
  */
 package org.onosproject.k8snetworking.impl;
 
-import io.fabric8.kubernetes.api.model.networking.NetworkPolicy;
+import io.fabric8.kubernetes.api.model.networking.v1.NetworkPolicy;
 import io.fabric8.kubernetes.client.KubernetesClient;
-import io.fabric8.kubernetes.client.KubernetesClientException;
 import io.fabric8.kubernetes.client.Watcher;
+import io.fabric8.kubernetes.client.WatcherException;
 import org.onosproject.cluster.ClusterService;
 import org.onosproject.cluster.LeadershipService;
 import org.onosproject.cluster.NodeId;
@@ -160,7 +160,7 @@
         }
 
         @Override
-        public void onClose(KubernetesClientException e) {
+        public void onClose(WatcherException e) {
             log.warn("Network policy watcher OnClose", e);
         }