fix dtChamberEfficiency for Heavy Ions

[fcavallo]

There were two problems:

1. StandAloneSETMuons not existing in HI express data set
2. a cut on the number of recHits associated to StandAlone being too tight for HI
   (it is 20 for pp, I had to decrease it to 5 for HI, see attachment)

The newly created file
/DQM/DTMonitorModule/python/dtChamberEfficiencyHI_cfi.py
is now included in
/DQM/DTMonitorModule/python/dtDQMOfflineSources_HI_cff.py
(newly created as well)

In order to actually use it I modified
https://github.com/fcavallo/cmssw/blob/HIfix/DQMOffline/Configuration/python/DQMOfflineHeavyIons_cff.py#L11

[cmsbuild]

A new Pull Request was created by @fcavallo (Francesca Romana Cavallo) for CMSSW_8_0_X.

It involves the following packages:

DQM/DTMonitorModule
DQMOffline/Configuration

@cmsbuild, @vanbesien, @deguio, @davidlange6 can you please review it and eventually sign? Thanks.
@threus, @rociovilar this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

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[deguio]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10374/console

[cmsbuild]

+1
Tested at: 7fb4747
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12839/10374/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12839/10374/summary.html

[deguio]

+1
not sure if and when there will be some HI data reprocessing. it may be useful to have this in 76 as well.
ciao and thanks,
F.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar