phase1Pixel era digitisation additions

[mark-grimes]

First tranche of phase1Pixel era additions. I'll try and split these down by package to make them easier to integrate. This one is for the digitisation.

There should be no change whatsoever unless the Run2_2017 era is active (the only top-level era that contains phase1Pixel).

The change to the import in the pixelDigitizer_cfi.py file is for technical reasons, otherwise the pileup dependent inefficiency is not applied. Depending on how #12256 pans out this might be able to be removed (will do that later though).

Tests might fail until the next IB - requires #12254 which has only just been merged. Not sure if the relevant commit will be included automatically.

@boudoul, @atricomi

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_8_0_X.

phase1Pixel era digitisation additions

It involves the following packages:

SimGeneral/MixingModule

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@wmtan this is something you requested to watch as well.
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@Degano you are the release manager for this.
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