Remove tail_proc, as we read the file directly.

src/calng/CrystfelRunner.py

@@ -335,7 +335,7 @@ class CrystfelRunner(PythonDevice):
     def __init__(self, config):
         super().__init__(config)
         self._crystfel_proc = None
-        self._tail_proc = None
+        #self._tail_proc = None
 
         self.KARABO_SLOT(self.startCrystfel)
         self.KARABO_SLOT(self.stopCrystfel)
@@ -389,7 +389,7 @@ class CrystfelRunner(PythonDevice):
         self.updateState(State.STARTED)
 
     def stopCrystfel(self):
-        self._tail_proc.terminate()
+        #self._tail_proc.terminate()
         self._crystfel_proc.terminate()
         self.updateState(State.STOPPED)