Fix PartitionedAsyncLeaderElector to ensure status change listeners are properly handled

Change-Id: I9fa1268ba07734130ab7618e2110c053499bf1f1
(cherry picked from commit a82b2171)

@@ -28,7 +28,6 @@ import org.onosproject.cluster.NodeId;
 import org.onosproject.cluster.PartitionId;
 import org.onosproject.cluster.PartitionId;
 import org.onosproject.event.Change;
 import org.onosproject.event.Change;
 import org.onosproject.store.service.AsyncLeaderElector;
 import org.onosproject.store.service.AsyncLeaderElector;
-
 import com.google.common.collect.Maps;
 import com.google.common.collect.Maps;
 
 
 /**
 /**
@@ -126,4 +125,19 @@ public class PartitionedAsyncLeaderElector implements AsyncLeaderElector {
     private Collection<AsyncLeaderElector> getLeaderElectors() {
     private Collection<AsyncLeaderElector> getLeaderElectors() {
         return partitions.values();
         return partitions.values();
     }
     }
+
+    @Override
+    public void addStatusChangeListener(Consumer<Status> listener) {
+        partitions.values().forEach(elector -> elector.addStatusChangeListener(listener));
+    }
+
+    @Override
+    public void removeStatusChangeListener(Consumer<Status> listener) {
+        partitions.values().forEach(elector -> elector.removeStatusChangeListener(listener));
+    }
+
+    @Override
+    public Collection<Consumer<Status>> statusChangeListeners() {
+        throw new UnsupportedOperationException();
+    }
 }
 }
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