clean batch operations

Change-Id: I7187de40bb5276d6ae9e9831e5d47d36e16560ad
diff --git a/core/net/src/test/java/org/onlab/onos/net/flow/impl/FlowRuleManagerTest.java b/core/net/src/test/java/org/onlab/onos/net/flow/impl/FlowRuleManagerTest.java
index 86f3ddc..5b363da 100644
--- a/core/net/src/test/java/org/onlab/onos/net/flow/impl/FlowRuleManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/net/flow/impl/FlowRuleManagerTest.java
@@ -28,6 +28,7 @@
 import org.onlab.onos.net.PortNumber;
 import org.onlab.onos.net.device.DeviceListener;
 import org.onlab.onos.net.device.DeviceService;
+import org.onlab.onos.net.flow.CompletedBatchOperation;
 import org.onlab.onos.net.flow.DefaultFlowEntry;
 import org.onlab.onos.net.flow.DefaultFlowRule;
 import org.onlab.onos.net.flow.FlowEntry;
@@ -408,7 +409,7 @@
         }
 
         @Override
-        public Future<Void> executeBatch(
+        public Future<CompletedBatchOperation> executeBatch(
                 BatchOperation<FlowRuleBatchEntry> batch) {
             // TODO Auto-generated method stub
             return null;