CORD-12:Adding support for port statistics REST API

Change-Id: Ibf0f7848ed891500e797d8f66bf7cd785b41c29c
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 3433b3b..c7af4e5 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
@@ -38,6 +38,7 @@
 import org.onosproject.net.flow.FlowEntry;
 import org.onosproject.net.flow.FlowRule;
 import org.onosproject.net.flow.TableStatisticsEntry;
+import org.onosproject.net.device.PortStatistics;
 import org.onosproject.net.flow.TrafficSelector;
 import org.onosproject.net.flow.TrafficTreatment;
 import org.onosproject.net.flow.criteria.Criterion;
@@ -102,6 +103,7 @@
         registerCodec(GroupBucket.class, new GroupBucketCodec());
         registerCodec(Load.class, new LoadCodec());
         registerCodec(TableStatisticsEntry.class, new TableStatisticsEntryCodec());
+        registerCodec(PortStatistics.class, new PortStatisticsCodec());
         log.info("Started");
     }