Add 'topo' prefix to cluster CLI command

Since so many people confuse that with ONOS distributed cluster

Change-Id: I9216e20f33be86bbd51526ad9c183f018cc4d206
diff --git a/cli/src/main/java/org/onosproject/cli/net/ClusterDevicesCommand.java b/cli/src/main/java/org/onosproject/cli/net/ClusterDevicesCommand.java
index bf1efc3..b81e9c3 100644
--- a/cli/src/main/java/org/onosproject/cli/net/ClusterDevicesCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/ClusterDevicesCommand.java
@@ -32,7 +32,7 @@
 /**
  * Lists devices of the specified topology cluster in the current topology.
  */
-@Command(scope = "onos", name = "cluster-devices",
+@Command(scope = "onos", name = "topo-cluster-devices",
          description = "Lists devices of the specified topology cluster in the current topology")
 public class ClusterDevicesCommand extends ClustersListCommand {