Fix bug of not stopping immediately on CANCEL while PAUSED.

The service threads do not terminate immediately, but, instead
each service thread picks up one more job before terminating,
causing servicing more jobs which are not reported back to portal.

src/main/java/altk/comm/engine/Broadcast.java

@@ -290,7 +290,7 @@ public abstract class Broadcast
         public void run()
         {
             myLogger.info("Thread starting...");
-            while (! serviceThreadsShouldStop())
+            for (;;)
             {
                 if (serviceThreadsShouldPause())
                 {
@@ -308,6 +308,7 @@ public abstract class Broadcast
                         }
                     }
                 }
+                if (serviceThreadsShouldStop()) break;
                 // Get a batch of jobs, if available
     			myLogger.debug("Looking for jobs");
                 List<Job> batch =  new ArrayList<Job>();