Fix: register ManagedFieldsEntry and FieldsV1 classes into kryo

Change-Id: I4a9f747b9b3d91a75f5f90805daf34a13726e7e0
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java
index cda25e2..225158a 100644
--- a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java
@@ -17,9 +17,11 @@
 
 import com.google.common.collect.ImmutableSet;
 import io.fabric8.kubernetes.api.model.ClientIPConfig;
+import io.fabric8.kubernetes.api.model.FieldsV1;
 import io.fabric8.kubernetes.api.model.IntOrString;
 import io.fabric8.kubernetes.api.model.LoadBalancerIngress;
 import io.fabric8.kubernetes.api.model.LoadBalancerStatus;
+import io.fabric8.kubernetes.api.model.ManagedFieldsEntry;
 import io.fabric8.kubernetes.api.model.ObjectMeta;
 import io.fabric8.kubernetes.api.model.Service;
 import io.fabric8.kubernetes.api.model.ServicePort;
@@ -87,6 +89,8 @@
             .register(IntOrString.class)
             .register(SessionAffinityConfig.class)
             .register(ClientIPConfig.class)
+            .register(ManagedFieldsEntry.class)
+            .register(FieldsV1.class)
             .register(LinkedHashMap.class)
             .register(Collection.class)
             .build();