[tests][worker] Fix queue data creation

beat/core/test/test_worker.py

@@ -145,10 +145,10 @@ class ControllerProcess(multiprocessing.Process):
         self.queue.put('STARTED')
 
         def onWorkerReady(name):
-            self.queue.put('READY ' + name.decode('utf-8'))
+            self.queue.put('READY %s' % name)
 
         def onWorkerGone(name):
-            self.queue.put('GONE ' + name.decode('utf-8'))
+            self.queue.put('GONE %s' % name)
 
         self.controller = WorkerController(
             '127.0.0.1',