Remove "public" to follow our convention

Change-Id: Ic52ca8b1bc5701ec8214ce1110d49511e39b4edb
diff --git a/openflow/api/src/main/java/org/onosproject/openflow/controller/OpenFlowEventListener.java b/openflow/api/src/main/java/org/onosproject/openflow/controller/OpenFlowEventListener.java
index 416a6e7..5deccf5 100644
--- a/openflow/api/src/main/java/org/onosproject/openflow/controller/OpenFlowEventListener.java
+++ b/openflow/api/src/main/java/org/onosproject/openflow/controller/OpenFlowEventListener.java
@@ -29,5 +29,5 @@
      * @param dpid switch data path identifier
      * @param msg the message
      */
-    public void handleMessage(Dpid dpid, OFMessage msg);
+    void handleMessage(Dpid dpid, OFMessage msg);
 }