CLI command to help debug the mapping of next-Objectives to the
groups that are created by device drivers.

Change-Id: Iff9e04e5e96b2cabbdb40e83215315d2e27791a6
diff --git a/apps/vtn/sfcmgr/src/test/java/org/onosproject/sfc/util/FlowObjectiveAdapter.java b/apps/vtn/sfcmgr/src/test/java/org/onosproject/sfc/util/FlowObjectiveAdapter.java
index 11f3667..36c5ca6 100644
--- a/apps/vtn/sfcmgr/src/test/java/org/onosproject/sfc/util/FlowObjectiveAdapter.java
+++ b/apps/vtn/sfcmgr/src/test/java/org/onosproject/sfc/util/FlowObjectiveAdapter.java
@@ -15,6 +15,8 @@
  */
 package org.onosproject.sfc.util;
 
+import java.util.List;
+
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.flowobjective.FilteringObjective;
 import org.onosproject.net.flowobjective.FlowObjectiveService;
@@ -55,4 +57,9 @@
     public ForwardingObjective forwardingObjective() {
         return forwardingObjective;
     }
+
+    @Override
+    public List<String> getNextMappings() {
+        return null;
+    }
 }