Be less verbose.

src/calng/CrystfelRunner.py

@@ -526,7 +526,7 @@ class CrystfelRunner(PythonDevice):
         # if we have not started CrystFEL, do nothing
         state = self.get('state')
         if state is not State.STARTED:
-            self.log.INFO("Device not started, so dropping input.")
+            self.log.DEBUG("Device not started, so dropping input.")
             return
 
         # otherwise forward the input to the queue