[Falcon][ONOS-2696] support method "replace" in ConsistentMap and method "notNull" in Match

Change-Id: I7c7d4644f963e52297785c2f9a5f21eff8723e61
diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultConsistentMap.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultConsistentMap.java
index 6f7b548..7841c16 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultConsistentMap.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultConsistentMap.java
@@ -156,6 +156,11 @@
     }
 
     @Override
+    public Versioned<V> replace(K key, V value) {
+        return complete(asyncMap.replace(key, value));
+    }
+
+    @Override
     public boolean replace(K key, V oldValue, V newValue) {
         return complete(asyncMap.replace(key, oldValue, newValue));
     }