introduce semi-deterministic smearing for e/gamma objects

[gpetruc]

Extend EGMSmearer to allow a semi-deterministic smearing dependent only on the event.

Needed for reproducibility of NanoAOD on MC when running multithreaded.

Uses std::seed_seq hash together a bunch of info about the event; tested on 50k events that the random numbers look random.

@arizzi @emanueledimarco @peruzzim

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/PR-20878/1347

[cmsbuild]

A new Pull Request was created by @gpetruc (Giovanni Petrucciani) for master.

It involves the following packages:

EgammaAnalysis/ElectronTools

@cmsbuild, @monttj can you please review it and eventually sign? Thanks.
@jainshilpi, @Sam-Harper, @varuns23 this is something you requested to watch as well.
@davidlange6, @slava77 you are the release manager for this.

cms-bot commands are listed here

[gpetruc]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/23650/console Started: 2017/10/10 18:29

[cmsbuild]

+1
Tested at: 7a44c12
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20878/23650/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
e802724
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20878/23650/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20878/23650/git-merge-result

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20878/23650/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 26
• DQMHistoTests: Total histograms compared: 2766087
• DQMHistoTests: Total failures: 108
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2765808
• DQMHistoTests: Total skipped: 171
• DQMHistoTests: Total Missing objects: 0
• Checked 107 log files, 10 edm output root files, 26 DQM output files

[davidlange6]

merge