register DefaultGroupId to Kryo

Change-Id: I650482164acf4b97f1bcd1a1633806a3b526a14d
diff --git a/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java b/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
index 535b996..0d81f69 100644
--- a/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
+++ b/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
@@ -26,6 +26,7 @@
 import org.junit.Test;
 import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.cluster.RoleInfo;
+import org.onlab.onos.core.DefaultGroupId;
 import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.Annotations;
 import org.onlab.onos.net.ConnectPoint;
@@ -337,6 +338,12 @@
     }
 
     @Test
+    public void testDefaultGroupId() {
+        testSerializedEquals(new DefaultGroupId(99));
+    }
+
+
+    @Test
     public void testAnnotations() {
         // Annotations does not have equals defined, manually test equality
         final byte[] a1Bytes = serializer.encode(A1);