mcast app changes for karaf 4.2.1 CLI

Change-Id: Ieac2667bf0c0d6c5492ec96de124e9ab211d27ed
diff --git a/apps/mcast/cli/src/main/java/org/onosproject/mcast/cli/McastGroupCompleter.java b/apps/mcast/cli/src/main/java/org/onosproject/mcast/cli/McastGroupCompleter.java
index 9c4bddd..cf10dc5 100644
--- a/apps/mcast/cli/src/main/java/org/onosproject/mcast/cli/McastGroupCompleter.java
+++ b/apps/mcast/cli/src/main/java/org/onosproject/mcast/cli/McastGroupCompleter.java
@@ -16,6 +16,7 @@
 
 package org.onosproject.mcast.cli;
 
+import org.apache.karaf.shell.api.action.lifecycle.Service;
 import org.onlab.packet.IpAddress;
 import org.onlab.util.Tools;
 import org.onosproject.cli.AbstractChoicesCompleter;
@@ -29,6 +30,7 @@
 /**
  * Mcast group Completer.
  */
+@Service
 public class McastGroupCompleter extends AbstractChoicesCompleter {
 
     @Override