Bug-fix: Remove flows from voltha for deleted subscriber, even if sadis cannot
fetch information about the deleted subscriber.

Other changes:
      - Added a cli command that details subscribers that have actually been programmed in the data plane
      - Changed all cli commands to start with volt-* as all app cli commands should
      - removed DeviceIdCompleter from the 'olts' cli command as it is not needed
      - removed unused method, renamed another one, fixed some logs
      - S-tags are no longer 'DeviceVlans', so changed variable name

Change-Id: I7cfde850669ed5b581fbac3195f68da28c4514c3
diff --git a/app/src/main/java/org/opencord/olt/cli/ShowOltCommand.java b/app/src/main/java/org/opencord/olt/cli/ShowOltCommand.java
index a256ccd..d01e8e2 100644
--- a/app/src/main/java/org/opencord/olt/cli/ShowOltCommand.java
+++ b/app/src/main/java/org/opencord/olt/cli/ShowOltCommand.java
@@ -18,14 +18,13 @@
 
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
-
 import org.opencord.olt.AccessDeviceService;
 
 /**
  * Shows configured OLTs.
  */
-@Command(scope = "onos", name = "olts",
-        description = "Shows OLTs connected to ONOS")
+@Command(scope = "onos", name = "volt-olts",
+        description = "Shows vOLTs connected to ONOS")
 public class ShowOltCommand extends AbstractShellCommand {
 
     @Override