Move deprecated flow batch APIs to a less obvious place

Change-Id: I8078aadbafad1e5a339d74859bed94e25c9c6e8c
diff --git a/core/api/src/main/java/org/onosproject/net/flow/FlowRuleStoreDelegate.java b/core/api/src/main/java/org/onosproject/net/flow/FlowRuleStoreDelegate.java
index 7b31f48..3e712f2 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/FlowRuleStoreDelegate.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/FlowRuleStoreDelegate.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.net.flow;
 
+import org.onosproject.net.flow.oldbatch.FlowRuleBatchEvent;
 import org.onosproject.store.StoreDelegate;
 
 /**