Replace ConfigParser with configparser (Python3 compatibility)

[silviodonato]

PR description:

This PR replaces "import ConfigParser" (compatible only with Python2.X) with "import configparser as ConfigParser" (compatible with both Python 2 and Python 3).
See https://python-future.org/compatible_idioms.html#configparser.

This PR will fix the unit test error of Alignment/OfflineValidation in Python 3
https://cmssdt.cern.ch/SDT/cgi-bin/logreader/slc7_amd64_gcc820/CMSSW_11_1_PY3_X_2020-01-28-2300/unitTestLogs/Alignment/OfflineValidation#/
The unit test was added with #28739.

PR validation:

Unit tests

[cmsbuild]

The code-checks are being triggered in jenkins.

[silviodonato]

please test

[silviodonato]

please test for CMSSW_11_1_PY3_X

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-28822/13541

• This PR adds an extra 64KB to repository

[cmsbuild]

The tests are being triggered in jenkins.
Test Parameters:

• RELEASE_FORMAT = CMSSW_11_1_PY3_X
  https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/4413/console Started: 2020/01/29 17:52
  https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/4415/console Started: 2020/01/29 17:55
  https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/4416/console Started: 2020/01/29 18:02

[cmsbuild]

A new Pull Request was created by @silviodonato (Silvio Donato) for master.

It involves the following packages:

Alignment/APEEstimation
Alignment/OfflineValidation
CondCore/DBOutputService
DQM/Integration
DQMOffline/Alignment
FastSimulation/Calorimetry
Geometry/TrackerCommonData
HLTriggerOffline/Btag
RecoVertex/BeamSpotProducer

@andrius-k, @lveldere, @slava77, @schneiml, @ianna, @fioriNTU, @tlampen, @pohsun, @perrotta, @civanch, @makortel, @cmsbuild, @Dr15Jones, @cvuosalo, @mdhildreth, @jfernan2, @tocheng, @sbein, @ggovi, @ssekmen, @kmaeshima, @christopheralanwest, @franzoni can you please review it and eventually sign? Thanks.
@emilbols, @ghugo83, @HeinerTholen, @tlampen, @threus, @mmusich, @venturia, @vargasa, @makortel, @smoortga, @acaudron, @missirol, @ferencek, @rociovilar, @GiacomoSguazzoni, @rovere, @VinInn, @tocheng, @mschrode, @ebrondol, @mtosi, @dgulhan, @batinkov, @adewit, @JyothsnaKomaragiri, @mverzett, @matt-komm, @andrzejnovak, @pvmulder this is something you requested to watch as well.
@davidlange6, @silviodonato, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[silviodonato]

please test for CMSSW_11_1_X

[cmsbuild]

-1

Tested at: 75aa422

CMSSW: CMSSW_11_1_X_2020-01-29-1100
SCRAM_ARCH: slc7_amd64_gcc820
You can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8085fb/4416/summary.html

I found follow errors while testing this PR

Failed tests: Build Python3

• Build:

I found compilation warning when building: See details on the summary page.

• Python3:

I found errors:

*** Error compiling 'src/HLTriggerOffline/Btag/python/helper.py'...

[cmsbuild]

Comparison not run due to Build errors (RelVals and Igprof tests were also skipped)

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5a0f66/4479/summary.html

Comparison Summary:

• No significant changes to the logs found

[cmsbuild]

The tests are being triggered in jenkins.
Tested with other pull request(s) #28838
Test Parameters:

• RELEASE_FORMAT = CMSSW_11_1_PY3_X
  https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/4484/console Started: 2020/02/03 23:12

[cmsbuild]

+1
Tested at: 4369ce0
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5a0f66/4484/summary.html
CMSSW: CMSSW_11_1_PY3_X_2020-02-02-2300
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5a0f66/4484/summary.html

Comparison Summary:

• No significant changes to the logs found

[cmsbuild]

The tests are being triggered in jenkins.
Tested with other pull request(s) #28838
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/4496/console Started: 2020/02/04 16:14

[cmsbuild]

+1
Tested at: 4369ce0
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5a0f66/4496/summary.html
CMSSW: CMSSW_11_1_X_2020-02-04-1100
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5a0f66/4496/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 34
• DQMHistoTests: Total histograms compared: 2698043
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2697696
• DQMHistoTests: Total skipped: 346
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 33 files compared)
• Checked 147 log files, 16 edm output root files, 34 DQM output files

[silviodonato]

merge
please have a look when you have time db: @ggovi fastsim: @civanch @lveldere @mdhildreth @sbein @ssekmen