Cummulative 80X PRs for 81X: (#13558 #13572 #13588 #13596 #13602 #13607 #13621)

[Martin-Grunewald]

Cummulative PRs for 81X:
This PR contains the 80X PRs (#13558 #13572 #13588 #13596 #13602 #13607 #13621)
but for 81X so that they get integrated here first and then their 80X counterparts can be
integrated in 80X.

[cmsbuild]

A new Pull Request was created by @Martin-Grunewald (Martin Grunewald) for CMSSW_8_1_X.

It involves the following packages:

Calibration/HcalIsolatedTrackReco
DataFormats/HcalIsolatedTrack
DataFormats/L1GlobalTrigger
DataFormats/L1TGlobal
DataFormats/L1Trigger
DataFormats/MuonSeed
EventFilter/L1TRawToDigi
HLTrigger/Egamma
HLTrigger/HLTfilters
HLTrigger/JSONMonitoring
HLTrigger/Muon
HLTrigger/special
RecoEgamma/EgammaHLTProducers
RecoMuon/L2MuonSeedGenerator

@perrotta, @cmsbuild, @diguida, @cvuosalo, @fwyzard, @cerminar, @Martin-Grunewald, @franzoni, @slava77, @mmusich, @mulhearn, @davidlange6 can you please review it and eventually sign? Thanks.
@Sam-Harper, @battibass, @abbiendi, @jhgoh, @lgray, @bellan, @tocheng, @trocino, @bachtis, @rociovilar this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[Martin-Grunewald]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/11779/console

[cmsbuild]

+1
Tested at: caa2e40
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13645/11779/summary.html

[Martin-Grunewald]

+1

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13645/11779/summary.html

[mulhearn]

+1

[mmusich]

+1