Clean up legacy LArG4 configs

LArCalorimeter/LArG4/LArG4GenShowerLib/share/LArG4FSStartPointFilterBody.py

-# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
-ServiceMgr.MessageSvc.OutputLevel = INFO
-## Algorithm sequence
-from AthenaCommon.AlgSequence import AlgSequence
-topSequence = AlgSequence()
-
-## AthenaCommon flags
-from AthenaCommon.AthenaCommonFlags import athenaCommonFlags
-
-i = options['outevents']
-
-athenaCommonFlags.EvtMax = i
-athenaCommonFlags.PoolHitsOutput.set_Off()
-
-from AthenaCommon.AppMgr import theApp
-theApp.EvtMax = i
-
-import AthenaCommon.AtlasUnixGeneratorJob
-
-from TruthIO.TruthIOConf import HepMCReadFromFile
-read = HepMCReadFromFile()
-read.InputFile = options['outfile']
-topSequence += read
-
-from AthenaPoolCnvSvc.WriteAthenaPool import AthenaPoolOutputStream
-outStream = AthenaPoolOutputStream("OutStream")
-outStream.ItemList  = ["EventInfo#*", "McEventCollection#*"]
-
-outfile = options['outfile']
-if outfile.endswith(".ascii") :
-    outfile = outfile[:-6]
-outStream.OutputFile = outfile+".pool.root"