FIX of PU scenario mix_2015_25ns_FallMC_matchData_PoissonOOTPU_cfi.py

[franzoni]

FIX: EmbeddedRootSource does not exist in 74x, put back good-old Pool…Source

[franzoni]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10437/console

[cmsbuild]

A new Pull Request was created by @franzoni (Giovanni Franzoni) for CMSSW_7_4_X.

It involves the following packages:

SimGeneral/MixingModule

@cmsbuild, @civanch, @mdhildreth, @davidlange6 can you please review it and eventually sign? Thanks.
@wmtan this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

Following commands in first line of a comment are recognized

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• [@cmsbuild,] please test: L1/L2 and selected users to start jenkins tests
• [@cmsbuild,] please test with cms-sw/cmsdist#<PR>: L1/L2 and selected users to start jenkins tests using externals from cmsdist

[srimanob]

@franzoni
Thanks very much!

[cmsbuild]

+1
Tested at: d20bfb8
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12885/10437/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12885/10437/summary.html