Fix for Kryo related issue crossing OSGi bundle boundaries.

Change-Id: I121dfe360de14a5b4760e5d2fd8cb2db93e0be63
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
index 4a60eb8..bd0aa06 100644
--- a/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
@@ -16,6 +16,9 @@
 import com.google.common.collect.ImmutableSet;
 
 // TODO move to util, etc.
+/**
+ * Kryo Serializer for {@link DefaultPort}.
+ */
 public final class DefaultPortSerializer extends
         Serializer<DefaultPort> {
 
@@ -23,6 +26,9 @@
         = new CollectionSerializer(IpPrefix.class,
                             new IpPrefixSerializer(), false);
 
+    /**
+     * Default constructor.
+     */
     public DefaultPortSerializer() {
         // non-null, immutable
         super(false, true);