FastSim patches for running HLT Run2 menu in CMSSW_7_1_0 (backported fro...

FastSim patches for running HLT Run2 menu in CMSSW_7_1_0 (backported from 72X)
The two modified files:
M       FastSimulation/Tracking/python/HLTIterativeTracking_cff.py
M       FastSimulation/Tracking/python/HLTPixelTracksProducer_cfi.py
(already merged in 72X, and therefore no forward port is needed) only contain additional definition useful for running the Run2 HLT menu in 71X without the need of merging additional packages by hand. They do not affect any of the current workflows in 71X.