Add run2 pu trig prescale reweighting

[jsalfeld]

Added support for pile up reweighting according to trigger prescales

[cmsbuild]

A new Pull Request was created by @jsalfeld for CMSSW_8_0_X.

It involves the following packages:

RecoLuminosity/LumiDB

@ggovi, @cmsbuild, @davidlange6 can you please review it and eventually sign? Thanks.
@slava77, @Degano, @smuzaffar you are the release manager for this.

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[jsalfeld]

Can you look into this PR and approve?

[ggovi]

+1

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10954/console

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs after it passes the integration tests. This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[cmsbuild]

+1
Tested at: 9042c1c
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13020/10954/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13020/10954/summary.html