Method3 with hcal time slew update, backwards compatible

[davidlange6]

Picked up #11101
removed the empty customise functions to avoid merge conflicts
move changes in hcal time slew and method 3 scale into customise function as temporary solution while this is all being validated

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for CMSSW_7_5_X.

Method3 with hcal time slew update, backwards compatible

It involves the following packages:

CalibCalorimetry/HcalAlgos
HLTrigger/Configuration
RecoLocalCalo/HcalRecAlgos
RecoLocalCalo/HcalRecProducers
SLHCUpgradeSimulations/Configuration

@perrotta, @cmsbuild, @civanch, @diguida, @cvuosalo, @fwyzard, @mdhildreth, @Martin-Grunewald, @cerminar, @slava77, @mmusich can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @makortel, @geoff-smith, @jalimena, @argiro this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[davidlange6]

@cmsbuild, please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: ce3de74
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11274/8119/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
098c5ee
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11274/8119/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11274/8119/git-merge-result

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11274/8119/summary.html

[davidlt]

This breaks Clang on 7_6_X, yet the fix is trivial.