Fix mixing workflows that use playback

[mandrenguyen]

Back in 81X, PR #15436 caused the heavy-ion embedding workflows that use the playback mechanism to stop giving sensible results.
The symptom was that the primary vertex stopped being reconstructed, defaulting instead to the beamspot.
For 80X, we simply reverted the corresponding PR with PR #18528

This PR fixes the issue in the master. This can be seen by running wf 301 and scanning thru the PVs with FWLite as follows:
Events->Scan("recoVertexs_hiSelectedVertex__RECO.obj.position_.fCoordinates.fZ")
With this PR you will see distinct z-vertex values.

@mdhildreth : Can you have a look?

[cmsbuild]

A new Pull Request was created by @mandrenguyen for master.

It involves the following packages:

SimGeneral/MixingModule

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

cms-bot commands are listed here

[davidlange6]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/22025/console Started: 2017/08/02 19:23

[cmsbuild]

+1
Tested at: 0b39df9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22025/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
75a9ea0
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22025/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22025/git-merge-result

[cmsbuild]

Comparison job queued.

[civanch]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/22118/console Started: 2017/08/07 10:06

[cmsbuild]

+1
Tested at: 0b39df9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22118/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
909ea2f
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22118/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22118/git-merge-result

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-20024/22118/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 25
• DQMHistoTests: Total histograms compared: 2643105
• DQMHistoTests: Total failures: 239
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2642685
• DQMHistoTests: Total skipped: 181
• DQMHistoTests: Total Missing objects: 0
• Checked 102 log files, 14 edm output root files, 25 DQM output files

[civanch]

+1

[cmsbuild]

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

[davidlange6]

+1