Implement groups CLI command autocompletion

Change-Id: I0bb9eff30c03a5d08f69280879ec2be869cb6539
diff --git a/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java b/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java
index 2b25744..8083c96 100644
--- a/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java
@@ -45,6 +45,8 @@
         description = "Lists all groups in the system")
 public class GroupsListCommand extends AbstractShellCommand {
 
+    public static final String ANY = "any";
+
     private static final String FORMAT =
             "   id=0x%s, state=%s, type=%s, bytes=%s, packets=%s, appId=%s";
     private static final String BUCKET_FORMAT =