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;
     }
diff --git a/core/api/src/test/java/org/onosproject/store/service/ConsistentMapAdapter.java b/core/api/src/test/java/org/onosproject/store/service/ConsistentMapAdapter.java
index 18f9d63..a8db799 100644
--- a/core/api/src/test/java/org/onosproject/store/service/ConsistentMapAdapter.java
+++ b/core/api/src/test/java/org/onosproject/store/service/ConsistentMapAdapter.java
@@ -16,6 +16,7 @@
 package org.onosproject.store.service;
 
 import java.util.Collection;
+import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.Executor;
@@ -155,6 +156,11 @@
     }
 
     @Override
+    public Iterator<Map.Entry<K, Versioned<V>>> iterator() {
+        return null;
+    }
+
+    @Override
     public void addListener(MapEventListener<K, V> listener, Executor executor) {
 
     }