Add controller-wide of stats to REST API

src/main/java/net/floodlightcontroller/core/web/SwitchCounterResource.java

@@ -47,6 +47,7 @@ public class SwitchCounterResource extends CounterResourceBase {
         Long[] switchDpids;
         if (switchID.equalsIgnoreCase("all")) {
             switchDpids = floodlightProvider.getSwitches().keySet().toArray(new Long[0]);
+            getOneSwitchCounterJson(model, CounterStore.CONTROLLER_NAME, counterName);
             for (Long dpid : switchDpids) {
                 switchID = HexString.toHexString(dpid);