Fix a memory leak in DQMGenericClient

[dmitrijus]

Fixes https://its.cern.ch/jira/browse/CMSCOMPPR-1606

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/PR-21181/1835

[cmsbuild]

A new Pull Request was created by @dmitrijus (Dmitrijus) for master.

It involves the following packages:

DQMServices/ClientConfig

@vazzolini, @kmaeshima, @dmitrijus, @cmsbuild, @jfernan2, @vanbesien can you please review it and eventually sign? Thanks.
@makortel, @barvic this is something you requested to watch as well.
@davidlange6, @slava77 you are the release manager for this.

cms-bot commands are listed here

[dmitrijus]

please test workflow 10024.0

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/24200/console Started: 2017/11/06 15:15

[cmsbuild]

+1
Tested at: 0292bfa
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21181/24200/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
a1a6991
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21181/24200/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21181/24200/git-merge-result

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21181/24200/summary.html

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: 2900266
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2900094
• DQMHistoTests: Total skipped: 171
• DQMHistoTests: Total Missing objects: 0
• Checked 107 log files, 10 edm output root files, 26 DQM output files

[fabozzi]

@dmitrijus
Can you please make a backport also for 92X? Recent relvals for HLT in 9_2_14 were affected by the harvesting failure as well

[dmitrijus]

+1

[dmitrijus]

I will, I was just waiting for the tests to finish.

[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 (and backports should be raised in the release meeting by the corresponding L2)

[davidlange6]

merge