ONOS-7077 Openflow 1.5 OXS and stat trigger support

Change-Id: I006bcd3d8eac451a780c7e5c69a12298ead14281
diff --git a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
index 4ec4a69..a281927 100644
--- a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
+++ b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
@@ -134,8 +134,9 @@
             return new FlowModBuilderVer10(flowRule, factory, xid, driverService);
         case OF_13:
         case OF_14:
-        case OF_15:
             return new FlowModBuilderVer13(flowRule, factory, xid, driverService);
+        case OF_15:
+            return new FlowModBuilderVer15(flowRule, factory, xid, driverService);
         default:
             throw new UnsupportedOperationException(
                     "No flow mod builder for protocol version " + factory.getVersion());