Various fixes to get a P4Runtime demo that works

Change-Id: Icab512fceeb6ec0faf1b402c1e325e055cdb2caf
diff --git a/incubator/bmv2/model/src/main/java/org/onosproject/bmv2/model/Bmv2HeaderModel.java b/incubator/bmv2/model/src/main/java/org/onosproject/bmv2/model/Bmv2HeaderModel.java
index 6c838c4..5585413 100644
--- a/incubator/bmv2/model/src/main/java/org/onosproject/bmv2/model/Bmv2HeaderModel.java
+++ b/incubator/bmv2/model/src/main/java/org/onosproject/bmv2/model/Bmv2HeaderModel.java
@@ -60,6 +60,7 @@
      *
      * @return name of this model
      */
+    @Override
     public String name() {
         return name;
     }