Fix: add missing PodIP class into kryo register

Change-Id: I63cc273c5d63429497a4ac0c701392e062c74fe6
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sPodStore.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sPodStore.java
index 65921dc..7f2a51d 100644
--- a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sPodStore.java
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sPodStore.java
@@ -54,6 +54,7 @@
 import io.fabric8.kubernetes.api.model.PodAffinityTerm;
 import io.fabric8.kubernetes.api.model.PodAntiAffinity;
 import io.fabric8.kubernetes.api.model.PodCondition;
+import io.fabric8.kubernetes.api.model.PodIP;
 import io.fabric8.kubernetes.api.model.PodSecurityContext;
 import io.fabric8.kubernetes.api.model.PodSpec;
 import io.fabric8.kubernetes.api.model.PodStatus;
@@ -146,6 +147,7 @@
             .register(PodSpec.class)
             .register(PodStatus.class)
             .register(PodCondition.class)
+            .register(PodIP.class)
             .register(Container.class)
             .register(EnvVar.class)
             .register(EnvVarSource.class)