Implement REST APIs for link flow statistics

Change-Id: I65ca3cec9dd1771a70811afd319619827f7b9010
diff --git a/core/common/src/main/java/org/onosproject/codec/impl/CodecManager.java b/core/common/src/main/java/org/onosproject/codec/impl/CodecManager.java
index 4b8c474..eb53152 100644
--- a/core/common/src/main/java/org/onosproject/codec/impl/CodecManager.java
+++ b/core/common/src/main/java/org/onosproject/codec/impl/CodecManager.java
@@ -47,6 +47,7 @@
 import org.onosproject.net.intent.HostToHostIntent;
 import org.onosproject.net.intent.Intent;
 import org.onosproject.net.intent.PointToPointIntent;
+import org.onosproject.net.statistic.Load;
 import org.onosproject.net.topology.Topology;
 import org.onosproject.net.topology.TopologyCluster;
 import org.slf4j.Logger;
@@ -97,6 +98,7 @@
         registerCodec(Group.class, new GroupCodec());
         registerCodec(Driver.class, new DriverCodec());
         registerCodec(GroupBucket.class, new GroupBucketCodec());
+        registerCodec(Load.class, new LoadCodec());
         log.info("Started");
     }