catch-up update to #21775 in JetFlavourClustering

[slava77]

this is a catch-up improvement to #21775 to reserve for the lepton size as well when it's used.

I also played a bit with the std::move in fjClusterSeq_ = ClusterSequencePtr( new fastjet::ClusterSequence( fjInputs, *fjJetDefinition_ ) );, as it seemed to improve the memory peak at first, but after re-sampling/rerunning a few times I could not see a significant improvement.

[cmsbuild]

The code-checks are being triggered in jenkins.

[slava77]

@cmsbuild please test

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-21781/2746

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/25264/console Started: 2017/12/22 20:24

[cmsbuild]

A new Pull Request was created by @slava77 (Slava Krutelyov) for master.

It involves the following packages:

PhysicsTools/JetMCAlgos

@cmsbuild, @monttj can you please review it and eventually sign? Thanks.
@imarches, @acaudron, @JyothsnaKomaragiri, @mverzett, @ferencek, @pvmulder 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

[cmsbuild]

+1
Tested at: b060f7b
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21781/25264/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
ecabeb2
4ced3c7
66af105
f353846
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21781/25264/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21781/25264/git-merge-result

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21781/25264/summary.html

@slava77 comparisons for the following workflows were not done due to missing matrix map:

• /build/cmsbld/jenkins-workarea/workspace/compare-root-files-short-matrix/results/JR-comparison/PR-21781/1325.7_TTbar_13_94XNanoAODINPUT+TTbar_13_94XNanoAODINPUT+NANOEDMMC2017

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 26
• DQMHistoTests: Total histograms compared: 2773742
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2773572
• DQMHistoTests: Total skipped: 169
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 1.13999999995 KiB( 22 files compared)
• Checked 110 log files, 9 edm output root files, 26 DQM output files

[davidlange6]

merge