Adding additional resources for instantiating async consistent treemaps.

Change-Id: I7bfc602ac22eda1844fea2a7b3e3133f83157bf3
diff --git a/core/api/src/test/java/org/onosproject/store/service/StorageServiceAdapter.java b/core/api/src/test/java/org/onosproject/store/service/StorageServiceAdapter.java
index 0cd1b60..e75c59e 100644
--- a/core/api/src/test/java/org/onosproject/store/service/StorageServiceAdapter.java
+++ b/core/api/src/test/java/org/onosproject/store/service/StorageServiceAdapter.java
@@ -63,4 +63,8 @@
     public <T> Topic<T> getTopic(String name, Serializer serializer) {
         return null;
     }
+
+    public <V> ConsistentTreeMapBuilder<V> consistentTreeMapBuilder() {
+        return null;
+    }
 }