skip getting event auxiliary if duplicate checker is disabled

[dan131riley]

RootFile::initializeDuplicateChecker() calls fillThisEventAuxiliary() even if checking for duplicates is disabled. We've observed that this can lead to the EventTree TTreeCache prefetching the entire EventAuxiliary branch, reading records scattered throughout the entire file. This PR skips all duplicate checker initialization if checking is disabled. DuplicateChecker::inputFileOpened() is a no-op if duplicate checking is disabled, so this change should be safe. Partially addresses issue #24780

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-24787/6729

[cmsbuild]

A new Pull Request was created by @dan131riley (Dan Riley) for master.

It involves the following packages:

IOPool/Input

@cmsbuild, @smuzaffar, @Dr15Jones can you please review it and eventually sign? Thanks.
@wddgit 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

[Dr15Jones]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/30855/console Started: 2018/10/02 17:16

[Dr15Jones]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs after it passes the integration tests. 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)

[cmsbuild]

+1
Tested at: b0768bf
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-24787/30855/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-24787/30855/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 2 differences found in the comparisons
• DQMHistoTests: Total files compared: 32
• DQMHistoTests: Total histograms compared: 3162800
• DQMHistoTests: Total failures: 2
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3162601
• DQMHistoTests: Total skipped: 197
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 31 files compared)
• Checked 134 log files, 14 edm output root files, 32 DQM output files

[fabiocos]

+1