Add back RPC customs to HGCal scenario

[mark-grimes]

Effectively just adds back the line

process=customise_rpc(process)

to the HGCal scenario.

[cmsbuild]

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

Add back RPC customs to HGCal scenario

It involves the following packages:

SLHCUpgradeSimulations/Configuration

@cmsbuild, @civanch, @Degano, @mdhildreth, @nclopezo can you please review it and eventually sign? Thanks.
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@andersonjacob, @mark-grimes you are the release manager for this.
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[mark-grimes]

merge

Tested with #3985.
Tests 10000, 10200, 10400, 11200, 11400, 12000, 12400, 12800, 13000, 13600, 13800, 14000 and 14600 pass all steps.
Tests 12200, 12600, 14200 and 14400 fail in step 2 with the same errors as the IB (listed on #3982 if you really want to know).