Adding experimental Flow Objective composition

Change-Id: I35e4414845ad5034145157ab83f933e40f75a1d9
diff --git a/core/net/src/main/java/org/onosproject/net/flowobjective/impl/FlowObjectiveManager.java b/core/net/src/main/java/org/onosproject/net/flowobjective/impl/FlowObjectiveManager.java
index 4247f03..7d0713b 100644
--- a/core/net/src/main/java/org/onosproject/net/flowobjective/impl/FlowObjectiveManager.java
+++ b/core/net/src/main/java/org/onosproject/net/flowobjective/impl/FlowObjectiveManager.java
@@ -218,6 +218,9 @@
         return flowObjectiveStore.allocateNextId();
     }
 
+    @Override
+    public void initPolicy(String policy) {}
+
     private boolean queueObjective(DeviceId deviceId, ForwardingObjective fwd) {
         if (fwd.nextId() != null &&
                 flowObjectiveStore.getNextGroup(fwd.nextId()) == null) {