add pileup scenario for 2016 ultra legacy (10_6_X backport)

[gkrintir]

PR description:

Backport from #28595

@srimanob

[cmsbuild]

A new Pull Request was created by @gkrintir (Georgios Konstantinos Krintiras) for CMSSW_10_6_X.

It involves the following packages:

Configuration/StandardSequences
SimGeneral/MixingModule

@civanch, @kpedro88, @cmsbuild, @franzoni, @mdhildreth, @fabiocos, @davidlange6 can you please review it and eventually sign? Thanks.
@makortel, @felicepantaleo, @GiacomoSguazzoni, @rovere, @VinInn, @Martin-Grunewald, @dgulhan this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[fabiocos]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/3946/console Started: 2019/12/12 14:07

[fabiocos]

+operations

the backport is coherent with master

[fabiocos]

+1

[cmsbuild]

+1
Tested at: 03415b9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-cbff7e/3946/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-cbff7e/3946/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 33
• DQMHistoTests: Total histograms compared: 3212324
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3211989
• DQMHistoTests: Total skipped: 334
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 32 files compared)
• Checked 137 log files, 14 edm output root files, 33 DQM output files

[fabiocos]

+1

[fabiocos]

merge

@civanch this PR is trivial