fix the bug of ClusterMetadata can not be changed

Change-Id: I6bf0d4c40f47dfc3a1a50ebe31f2e00321f149cf
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java
index 74fef44..5f22d15 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java
@@ -357,6 +357,7 @@
                     .stream()
                     .filter(PartitionDiff::hasChanged)
                     .forEach(diff -> activePartitions.get(diff.partitionId()).onUpdate(diff.newValue()));
+        currentClusterMetadata.set(clusterMetadata);
     }
 
     private class InternalClusterEventListener implements ClusterEventListener {