Completer fixes for core ONOS CLI commands

Change-Id: Icedfc542ad93a2825b592f3deb6cd96d91779544
diff --git a/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java
index 4b554a7..2baace7 100644
--- a/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java
+++ b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java
@@ -18,6 +18,7 @@
 
 import static org.onlab.osgi.DefaultServiceDirectory.getService;
 
+import org.apache.karaf.shell.api.action.lifecycle.Service;
 import org.onosproject.cli.AbstractChoicesCompleter;
 import org.onosproject.incubator.net.virtual.NetworkId;
 import org.onosproject.incubator.net.virtual.VirtualDevice;
@@ -34,6 +35,7 @@
  *
  * Assumes the first argument which can be parsed to a number is network id.
  */
+@Service
 public class VirtualDeviceCompleter extends AbstractChoicesCompleter {
     @Override
     protected List<String> choices() {