8_3_0 bug fixes

[davidlange6]

Candidate 1 of fixes on top of 900pre4 for making CMSSW_8_3_0.

#17438
git cms-addpkg RecoTracker/DeDx RecoTracker/TkSeedGenerator RecoTauTag/HLTProducers
git cherry-pick 163bdb7 1969bd5

#17412
git cms-addpkg HLTrigger/Configuration
git cherry-pick 38f6eaf 4e316f6 bc24b46 a44496f 49b58ca
485d8152d4f8b08746eca467

#17539
git cms-addpkg Alignment/OfflineValidation
git cherry-pick 1258c84 e4ec05f 462bdbb

#17582
git cms-addpkg DQM/TrackingMonitorSource
git fetch [email protected]:makortel/cmssw silenceTrackSelector
git cherry-pick 8732900

#17579
git cms-addpkg DQM/HcalCommon
git fetch [email protected]:vkhristenko/cmssw fixconstspecifier
git cherry-pick 35b27cf

#17576
git cms-addpkg DQMOffline/JetMET Validation/RecoTau
git fetch [email protected]:davidlange6/cmssw cmsignores
git cherry-pick 8aad06f 72ff42c

#17572
git cms-addpkg L1Trigger/L1TGlobal
git cherry-pick ee79e59

git cms-addpkg Configuration/PyReleaseValidation
#17422
git cherry-pick 64d48a2
#17464
git cherry-pick 12d6632
#17531
git cherry-pick fb56497
#17458
git cherry-pick c3e61cb

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for CMSSW_8_3_X.

It involves the following packages:

Alignment/OfflineValidation
Configuration/PyReleaseValidation
DQM/HcalCommon
DQM/TrackingMonitorSource
DQMOffline/JetMET
HLTrigger/Configuration
L1Trigger/L1TGlobal
RecoTauTag/HLTProducers
RecoTracker/DeDx
RecoTracker/TkSeedGenerator
Validation/RecoTau

@perrotta, @cmsbuild, @ghellwig, @silviodonato, @cvuosalo, @arunhep, @franzoni, @kpedro88, @fabozzi, @Martin-Grunewald, @rekovic, @srimanob, @cerminar, @slava77, @fwyzard, @mmusich, @vanbesien, @hengne, @mulhearn, @dmitrijus can you please review it and eventually sign? Thanks.
@ghellwig, @rappoccio, @jalimena, @felicepantaleo, @TaiSakuma, @Martin-Grunewald, @fioriNTU, @tlampen, @threus, @geoff-smith, @mmarionncern, @kreczko, @hdelanno, @makortel, @jdolen, @rociovilar, @GiacomoSguazzoni, @rovere, @VinInn, @nhanvtran, @gkasieczka, @tocheng, @deguio, @schoef, @mschrode, @idebruyn, @mmusich, @mtosi, @dgulhan, @ahinzmann, @gpetruc, @mariadalfonso this is something you requested to watch as well.
@davidlange6, @smuzaffar you are the release manager for this.

cms-bot commands are listed here #13028