Add a new Accelerators_cff to collect all 'standard' ProcessAccelerators

Thanks to Andrea Bocci for the suggestion.

Configuration/StandardSequences/python/Accelerators_cff.py

@@ -0,0 +1,6 @@
+import FWCore.ParameterSet.Config as cms
+
+# This fragment is intended to collect all ProcessAccelerator objects
+# used in production
+
+from HeterogeneousCore.CUDACore.ProcessAcceleratorCUDA_cfi import ProcessAcceleratorCUDA

Configuration/StandardSequences/python/Services_cff.py

@@ -8,13 +8,14 @@
 # DQM store service
 from DQMServices.Core.DQMStore_cfi import *
 
-# load CUDA services when the "gpu" or "pixelNtupletFit" modifiers are enabled
-def _addCUDAServices(process):
-    process.load("HeterogeneousCore.CUDACore.ProcessAcceleratorCUDA_cfi")
+# load ProcessAccelerators (that set the e.g. the necessary CUDA
+# stuff) when the "gpu" or "pixelNtupletFit" modifiers are enabled
+def _addProcessAccelerators(process):
+    process.load("Configuration.StandardSequences.Accelerators_cff")
 
 from Configuration.ProcessModifiers.gpu_cff import gpu
 from Configuration.ProcessModifiers.pixelNtupletFit_cff import pixelNtupletFit
-modifyConfigurationStandardSequencesServicesAddCUDAServices_ = (gpu | pixelNtupletFit).makeProcessModifier(_addCUDAServices)
+modifyConfigurationStandardSequencesServicesAddProcessAccelerators_ = (gpu | pixelNtupletFit).makeProcessModifier(_addProcessAccelerators)
 
 # load TritonService when SONIC workflow is enabled
 def _addTritonService(process):