SEBA-669 partial fix - protects volt app from repeated add-subscriber calls
or erroneous add and remove subscriber calls that happen too close to each other.

A complete fix would also require NEM to not make these calls - see SEBA-743 and SEBA-744.
A number of log messages were also improved.

Change-Id: I88bae2883d056b1fa1f5ebec6aa5e872e979b3c7
diff --git a/app/src/main/java/org/opencord/olt/cli/SubscriberRemoveCommand.java b/app/src/main/java/org/opencord/olt/cli/SubscriberRemoveCommand.java
index a6d901d..eaf6049 100644
--- a/app/src/main/java/org/opencord/olt/cli/SubscriberRemoveCommand.java
+++ b/app/src/main/java/org/opencord/olt/cli/SubscriberRemoveCommand.java
@@ -28,7 +28,7 @@
  * Adds a subscriber to an access device.
  */
 @Command(scope = "onos", name = "volt-remove-subscriber-access",
-        description = "Adds a subscriber to an access device")
+        description = "Removes a subscriber to an access device")
 public class SubscriberRemoveCommand extends AbstractShellCommand {
 
     @Argument(index = 0, name = "deviceId", description = "Access device ID",