shmemtrainmatcher: Always auto-start after initialization

src/calng/ShmemTrainMatcher.py

@@ -196,6 +196,8 @@ class ShmemTrainMatcher(TrainMatcher.TrainMatcher):
             # it is set already by super by default, so only need to turn off
             self.output = None
 
+        self.start()  # Auto-start this type of matcher.
+
     def preReconfigure(self, conf):
         super().preReconfigure(conf)
         if conf.has("merge") or conf.has("sources"):