Adding additional resources for instantiating async consistent treemaps.

Change-Id: I7bfc602ac22eda1844fea2a7b3e3133f83157bf3
diff --git a/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java b/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java
index 8421bb2..a04ef98 100644
--- a/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java
+++ b/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java
@@ -16,6 +16,7 @@
 package org.onosproject.vtnrsc.util;
 
 import org.onosproject.store.service.Topic;
+import org.onosproject.store.service.ConsistentTreeMapBuilder;
 import org.onosproject.store.service.WorkQueue;
 import org.onosproject.store.service.EventuallyConsistentMapBuilder;
 import org.onosproject.store.service.ConsistentMapBuilder;
@@ -42,6 +43,11 @@
     }
 
     @Override
+    public <V> ConsistentTreeMapBuilder<V> consistentTreeMapBuilder() {
+        return null;
+    }
+
+    @Override
     public <E> DistributedSetBuilder<E> setBuilder() {
         return null;
     }