Remove unused DQMStore pointers

[schneiml]

PR description:

This PR removes DQMStore member variables that are not used for anything.
These are likely residues from the "threaded migration" and where used in the past, but forgotten to remove once the last usages disappeared.

PR validation:

Manual review. The changes where machine-generated and manually adapted, behavior should not change.

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-26495/9351

• This PR adds an extra 80KB to repository

[cmsbuild]

A new Pull Request was created by @schneiml (Marcel Schneider) for master.

It involves the following packages:

CalibTracker/SiStripChannelGain
DQM/Physics
DQM/SiStripCommissioningClients
DQM/SiStripMonitorCluster
DQM/SiStripMonitorHardware
DQMOffline/EGamma
DQMOffline/Muon
DQMServices/Components
HLTriggerOffline/HeavyFlavor
Validation/EcalDigis
Validation/MuonIsolation

@andrius-k, @kmaeshima, @christopheralanwest, @schneiml, @tocheng, @cmsbuild, @franzoni, @jfernan2, @fioriNTU, @tlampen, @pohsun can you please review it and eventually sign? Thanks.
@erikbutz, @rappoccio, @echabert, @pieterdavid, @argiro, @fioriNTU, @threus, @hdelanno, @battibass, @jhgoh, @HuguesBrun, @ptcox, @trocino, @rociovilar, @abbiendi, @barvic, @rovere, @bellan, @tocheng, @jandrea, @alesaggio, @idebruyn, @mmusich, @mtosi, @gbenelli, @calderona, @folguera 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

[pohsun]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/34270/console Started: 2019/04/18 11:01

[cmsbuild]

+1
Tested at: 99584e4
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26495/34270/summary.html

[cmsbuild]

Comparison job queued.

[pohsun]

+1

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26495/34270/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 32
• DQMHistoTests: Total histograms compared: 3142783
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3142585
• DQMHistoTests: Total skipped: 197
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 31 files compared)
• Checked 133 log files, 14 edm output root files, 32 DQM output files

[andrius-k]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). 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)

[kpedro88]

+1