Fix trackingOnly DQM

[makortel]

TrackingOnly DQM currently fails with

$ cmsDriver.py step3_trk --datatier DQMIO --conditions auto:run1_mc -s RAW2DIGI,RECO:reconstruction_trackingOnly,VALIDATION:@trackingOnlyValidation,DQM:@trackingOnlyDQM --eventcontent DQM -n 100 --filein file:step2.root --fileout file:step3_inDQM.root --no_exec
...
Traceback (most recent call last):
  File ".../CMSSW_8_0_0/bin/slc6_amd64_gcc493/cmsDriver.py", line 55, in <module>
    run()
  File ".../CMSSW_8_0_0/bin/slc6_amd64_gcc493/cmsDriver.py", line 27, in run
    configBuilder.prepare()
  File ".../CMSSW_8_0_0/python/Configuration/Applications/ConfigBuilder.py", line 2058, in prepare
    self.addStandardSequences()
  File ".../CMSSW_8_0_0/python/Configuration/Applications/ConfigBuilder.py", line 741, in addStandardSequences
    getattr(self,"prepare_"+stepName)(sequence = '+'.join(stepSpec))
  File ".../CMSSW_8_0_0/python/Configuration/Applications/ConfigBuilder.py", line 1961, in prepare_DQM
    setattr(self.process,pathName, cms.Path( getattr(self.process, sequence) ) )
AttributeError: 'Process' object has no attribute 'DQMHarvestTracking'

I believe it got broken in #12604, and this PR fixes it.

Tested in 8_0_0, no changes expected. The branch is based on 8_0_0, so placing a corresponding PR for 80X, if needed, is trivial.

@rovere @VinInn

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_8_1_X.

It involves the following packages:

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.

cms-bot commands are list here #13028

[VinInn]

@cmsbuild , please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/11715/console

[cmsbuild]

+1
Tested at: bab8146
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13517/11715/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13517/11715/summary.html

[deguio]

+1
thanks. I simply missed that entry in my original PR.
sorry about that.
F.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_1_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1