Fix in Higgs HLT validation DQM for multithreading

[HuguesBrun]

This PR is a fix in the Higgs HLT validation DQM to permit it to work multithreaded.
The fix consists in filling the label of the efficiency summary when creating the histogram and not in the fly as before.

Two other small changes haves been done:

• the summary and PU histograms are created directly from a ebooker method and not using a intermediate TH1F
• the summary of efficiency plots is now created using the DQM generic client and not anymore using the HLTHiggsHarvesting class, which is removed.

The content of the plots is not changed by this PR

[cmsbuild]

A new Pull Request was created by @HuguesBrun (Hugues BRUN) for CMSSW_7_1_X.

Fix in Higgs HLT validation DQM for multithreading

It involves the following packages:

HLTriggerOffline/Higgs

@ojeda, @danduggan, @rovere, @cmsbuild, @nclopezo, @deguio, @Degano can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[cmsbuild]

+1
Tested at: dc1f722
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4281/1718/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4281/1718/summary.html

[deguio]

@HuguesBrun could you submit this PR to 72X first?
thanks,
F.

[HuguesBrun]

Hello @deguio ,

I just send the new PR, it is PR#4299
Thank you,
Hugues

[deguio]

+1
already tested in 72X #4299

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). @nclopezo, @ktf can you please take care of it?