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_2_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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[deguio]

+1
thanks @HuguesBrun

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes or unless it breaks tests.

[cmsbuild]

+1
Tested at: dc1f722
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4299/152/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes (tests are also fine).

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4299/152/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes (tests are also fine).