Fix: register ManagedFieldsEntry and FieldsV1 classes into kryo

Change-Id: I4a9f747b9b3d91a75f5f90805daf34a13726e7e0
(cherry picked from commit 7388ff5dfb98a69cba2deaf3cb29d0178072ced5)
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sIngressStore.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sIngressStore.java
index c6a0f49..f146f8c 100644
--- a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sIngressStore.java
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sIngressStore.java
@@ -16,8 +16,10 @@
 package org.onosproject.k8snetworking.impl;
 
 import com.google.common.collect.ImmutableSet;
+import io.fabric8.kubernetes.api.model.FieldsV1;
 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.extensions.Ingress;
 import io.fabric8.kubernetes.api.model.extensions.IngressBackend;
@@ -83,6 +85,8 @@
             .register(IngressTLS.class)
             .register(LoadBalancerStatus.class)
             .register(LoadBalancerIngress.class)
+            .register(ManagedFieldsEntry.class)
+            .register(FieldsV1.class)
             .build();
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY)