Added notion of a general Store abstraction and wired it up in ClusterStore.
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/ClusterStore.java b/core/api/src/main/java/org/onlab/onos/cluster/ClusterStore.java
index 4579190..ea5bbd3 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/ClusterStore.java
+++ b/core/api/src/main/java/org/onlab/onos/cluster/ClusterStore.java
@@ -1,11 +1,13 @@
package org.onlab.onos.cluster;
+import org.onlab.onos.store.Store;
+
import java.util.Set;
/**
* Manages inventory of controller cluster nodes; not intended for direct use.
*/
-public interface ClusterStore {
+public interface ClusterStore extends Store<ClusterEvent, ClusterStoreDelegate> {
/**
* Returns the local controller node.