added simple storage to SimpleFlowRuleManager

Change-Id: I7f9117c534673b00f2822cf90bd63d52b95d2704
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleService.java b/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleService.java
index 85d5680..71434c7 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleService.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleService.java
@@ -1,5 +1,7 @@
 package org.onlab.onos.net.flow;
 
+import java.util.List;
+
 import org.onlab.onos.net.DeviceId;
 
 /**
@@ -30,7 +32,7 @@
      * throws SomeKindOfException that indicates which ones were applied and
      *                  which ones failed
      */
-    void applyFlowRules(FlowRule... flowRules);
+    List<FlowEntry> applyFlowRules(FlowRule... flowRules);
 
     /**
      * Removes the specified flow rules from their respective devices. If the