Add LHEPtFilter plugin needed for MC generation [102X backport]

[ajgilbert]

PR description:

Backport of #28443, needed in 10_2_X for official production of 2018 MC using this filter.

Adds a new plugin in GeneratorInterface/GenFilters that applies a user specified pT (or pT range) cut to the p4 sum of a subset of LHE-level particles. This is needed specifically for the production of Wgamma samples binned in the photon pT, but may be useful more generally in the future.

PR validation:

All tests in runTheMatrix.py passed.

if this PR is a backport please specify the original PR:

Yes, #28443

[cmsbuild]

A new Pull Request was created by @ajgilbert (Andrew Gilbert) for CMSSW_10_2_X.

It involves the following packages:

GeneratorInterface/GenFilters

@SiewYan, @efeyazgan, @mkirsano, @cmsbuild, @agrohsje, @alberto-sanchez, @qliphy can you please review it and eventually sign? Thanks.
@alberto-sanchez, @agrohsje, @mkirsano 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/3825/console Started: 2019/12/05 17:28

[cmsbuild]

+1
Tested at: 4de234f
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b9caa2/3825/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b9caa2/3825/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 31
• DQMHistoTests: Total histograms compared: 3007491
• DQMHistoTests: Total failures: 2
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3007299
• DQMHistoTests: Total skipped: 190
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 30 files compared)
• Checked 129 log files, 14 edm output root files, 31 DQM output files

[qliphy]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_10_2_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_11_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @davidlange6, @slava77, @smuzaffar, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[fabiocos]

+1