Fix types in Merge.py, and RunMerge.py for missing mergeNANO default

[fabiocos]

PR description:

This PR proposes two independent fixes to Configuration/DataProcessing:

• the recent update of Merge.py from Add options to bypassVersionCheck in Merge step #26030 introduces a bug, as bypassVersionCheck should be defined from CfgTypes and not cms (see Fix config in Merge.py #26110 by @srimanob);

• while testing it I have realized RunMerge.py fails to build due to the lack of a mergeNano default, now added.

PR validation:

python RunMerge.py --input-files=a.root 

now runs smoothly and produces the desired RunMergeCfg.py output with the bypassVersionCheck option activated by default:

process.source = cms.Source("PoolSource",
    bypassVersionCheck = cms.untracked.bool(True),
    fileNames = cms.untracked.vstring("[\'a.root\']")
)

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-26120/8687

• This PR adds an extra 12KB to repository

[cmsbuild]

A new Pull Request was created by @fabiocos (Fabio Cossutti) for master.

It involves the following packages:

Configuration/DataProcessing

@cmsbuild, @franzoni, @fabiocos, @davidlange6 can you please review it and eventually sign? Thanks.
@Martin-Grunewald 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

[fabiocos]

please test

not testing really anything here

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/33489/console Started: 2019/03/08 18:39

[fabiocos]

+operations

the test configuration has been verified to build correctly as desired in a standalone check (see description)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs after it passes the integration tests. 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)

[fabiocos]

+1

[fabiocos]

merge

[cmsbuild]

+1
Tested at: 13ea81b
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26120/33489/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26120/33489/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 32
• DQMHistoTests: Total histograms compared: 3114829
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3114631
• 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