Hide all differences between mix and mixData with EDAliases

[makortel]

Currently the differences in sim digi (etc) module labels between classical mixing (mix) and premixing (mixData) are partially hidden from downstream modules by the aliases defined in
https://github.com/cms-sw/cmssw/blob/master/SimGeneral/MixingModule/python/aliases_cfi.py
https://github.com/cms-sw/cmssw/blob/master/SimGeneral/MixingModule/python/aliases_PreMix_cfi.py

These aliases should be extended to cover all outputs of mix and mixData, so that the downstream modules would not have to be customized with premix_stage2 modifier.

[cmsbuild]

A new Issue was created by @makortel Matti Kortelainen.

@davidlange6, @Dr15Jones, @smuzaffar, @fabiocos, @kpedro88 can you please review it and eventually sign/assign? Thanks.

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[Dr15Jones]

assign simulation

[cmsbuild]

New categories assigned: simulation

@civanch,@mdhildreth you have been requested to review this Pull request/Issue and eventually sign? Thanks

[kpedro88]

+infinity