[ONOS-6756] Replicate node version information for ISSU

Change-Id: Ibd31c573990f2732b7abf8615ca914ffb77615ec
diff --git a/core/net/src/main/java/org/onosproject/cluster/impl/ClusterManager.java b/core/net/src/main/java/org/onosproject/cluster/impl/ClusterManager.java
index a2b9000..b7c9045 100644
--- a/core/net/src/main/java/org/onosproject/cluster/impl/ClusterManager.java
+++ b/core/net/src/main/java/org/onosproject/cluster/impl/ClusterManager.java
@@ -44,6 +44,7 @@
 import org.onosproject.cluster.NodeId;
 import org.onosproject.cluster.Partition;
 import org.onosproject.cluster.PartitionId;
+import org.onosproject.core.Version;
 import org.onosproject.event.AbstractListenerManager;
 import org.slf4j.Logger;
 
@@ -135,6 +136,13 @@
     }
 
     @Override
+    public Version getVersion(NodeId nodeId) {
+        checkPermission(CLUSTER_READ);
+        checkNotNull(nodeId, INSTANCE_ID_NULL);
+        return store.getVersion(nodeId);
+    }
+
+    @Override
     public void markFullyStarted(boolean started) {
         store.markFullyStarted(started);
     }