Completer fixes for core ONOS CLI commands

Change-Id: Icedfc542ad93a2825b592f3deb6cd96d91779544
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 49a2571..2380462 100644
--- a/cli/src/main/java/org/onosproject/cli/net/ClusterDevicesCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/ClusterDevicesCommand.java
@@ -19,6 +19,7 @@
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.api.action.Argument;
 import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
 import org.apache.karaf.shell.api.action.lifecycle.Service;
 import org.onosproject.utils.Comparators;
 import org.onosproject.net.DeviceId;
@@ -40,6 +41,7 @@
 
     @Argument(index = 0, name = "id", description = "Cluster ID",
               required = true, multiValued = false)
+    @Completion(ClusterIdCompleter.class)
     String id = null;
 
     @Override