Implement lazy iterators/streams for ConsistentMap

Change-Id: Id643726441c99186667c104cfdd1dab95b06cf87
diff --git a/core/api/src/test/java/org/onosproject/store/service/AsyncConsistentMapAdapter.java b/core/api/src/test/java/org/onosproject/store/service/AsyncConsistentMapAdapter.java
index 85e8e19..f39e7d0 100644
--- a/core/api/src/test/java/org/onosproject/store/service/AsyncConsistentMapAdapter.java
+++ b/core/api/src/test/java/org/onosproject/store/service/AsyncConsistentMapAdapter.java
@@ -134,6 +134,11 @@
     }
 
     @Override
+    public CompletableFuture<AsyncIterator<Map.Entry<K, Versioned<V>>>> iterator() {
+        return null;
+    }
+
+    @Override
     public CompletableFuture<Void> addListener(MapEventListener<K, V> listener, Executor executor) {
         return null;
     }