CC-3367: Display in Now Playing whether Live DJ stream and Live Master stream

are connected and give user the ability to block those streams

- added stream source switch interface
- backend code

python_apps/pypo/pypomessagehandler.py

@@ -74,6 +74,9 @@ class PypoMessageHandler(Thread):
             elif command == 'cancel_current_show':
                 self.logger.info("Cancel current show command received...")
                 self.pypo_queue.put(message)
+            elif command == 'switch_source':
+                self.logger.info("switch_source command received...")
+                self.pypo_queue.put(message)
             elif command == 'update_recorder_schedule':
                 self.recorder_queue.put(message)
             elif command == 'cancel_recording':