Implement REST APIs for link flow statistics

Change-Id: I65ca3cec9dd1771a70811afd319619827f7b9010
diff --git a/web/api/src/main/webapp/WEB-INF/web.xml b/web/api/src/main/webapp/WEB-INF/web.xml
index 31577c0..06f80da 100644
--- a/web/api/src/main/webapp/WEB-INF/web.xml
+++ b/web/api/src/main/webapp/WEB-INF/web.xml
@@ -76,7 +76,8 @@
                 org.onosproject.rest.resources.FlowsWebResource,
                 org.onosproject.rest.resources.TopologyWebResource,
                 org.onosproject.rest.resources.ConfigWebResource,
-                org.onosproject.rest.resources.PathsWebResource
+                org.onosproject.rest.resources.PathsWebResource,
+                org.onosproject.rest.resources.StatisticsWebResource
             </param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>