Remove "public" to follow our convention

Change-Id: Ic5fa8744cbcb4c704780c8467ae0f31fce3327ce
diff --git a/core/api/src/main/java/org/onosproject/store/cluster/messaging/ClusterMessageHandler.java b/core/api/src/main/java/org/onosproject/store/cluster/messaging/ClusterMessageHandler.java
index 19c7dda..ce770a8 100644
--- a/core/api/src/main/java/org/onosproject/store/cluster/messaging/ClusterMessageHandler.java
+++ b/core/api/src/main/java/org/onosproject/store/cluster/messaging/ClusterMessageHandler.java
@@ -24,5 +24,5 @@
      * Handles/Processes the cluster message.
      * @param message cluster message.
      */
-    public void handle(ClusterMessage message);
+    void handle(ClusterMessage message);
 }