Replaced pixelVertices by firstStepPrimaryVertices made from iter0 tracks

Remove pixelTracks and pixelVertices from reco sequence.
Replaced with the higher quality firstStepPrimaryVertices introduced together with JetCoreTracks in 7.2

Minor regression observed.
One may even pretend that fake-rate decreases and conversions benefit.

you are right, I forgot to add this optimization also in FastSim.
(essentially in fastsim is still generating also the one with BeamSpotConstraint, that is not used anywhere)
We have not decided yet what is better though