Add the fix for old and new forward pixel DetId numbering to the Phase2 digitiser

[mark-grimes]

Forgot to include SiPhase2Digitizer in #4714. As far as I can tell it's never used anywhere, but it's best to include the DetId fix in that as well.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Add the fix for old and new forward pixel DetId numbering to the Phase2 digitiser

It involves the following packages:

SimTracker/SiPhase2Digitizer

The following packages do not have a category, yet:

SimTracker/SiPhase2Digitizer

@cmsbuild, @Degano, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
@GiacomoSguazzoni, @rovere, @VinInn, @cerati, @threus, @venturia this is something you requested to watch as well.
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@fratnikov, @mark-grimes you are the release manager for this.
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[mark-grimes]

merge

Only tested with muons. As far as I can tell there are no scenarios where this is in the sequence anyway.