Copy the L1 era changes from FullSim to FastSim

FastSimulation/Configuration/python/L1Reco_cff.py

@@ -1,7 +1,15 @@
 import FWCore.ParameterSet.Config as cms
 
 # the only thing FastSim runs from L1Reco is l1extraParticles
-from L1Trigger.Configuration.L1Reco_cff import l1extraParticles
+from L1Trigger.Configuration.L1Reco_cff import l1extraParticles, _loadMenuFromXML, _customiseForStage1
+
+# These next few lines copy the L1 era changes to FastSim
+from Configuration.StandardSequences.Eras import eras
+# A unique name is required for this object, so I'll call it "modify<python filename>ForRun2_"
+modifyFastSimulationConfigurationL1RecoForRun2_ = eras.run2_common.makeProcessModifier( _loadMenuFromXML )
+# Again, a unique name is required so I'll use "modify<python filename>ForStage1Trigger_"
+modifyFastSimulationConfigurationL1RecoForStage1Trigger_ = eras.stage1L1Trigger.makeProcessModifier( _customiseForStage1 )
+
 
 # some collections have different labels
 l1extraParticles.isolatedEmSource    = cms.InputTag("simGctDigis","isoEm")