Migrating TrigXMonitor to new DQM API

[vanbesien]

Migrated the following 4 modules to the new DQM api:
DQM/TrigXMonitor/interface/HLTScalers
DQM/TrigXMonitor/interface/HLTSeedL1LogicScalers
DQM/TrigXMonitor/interface/L1Scalers
DQM/TrigXMonitor/interface/L1TScalersSCAL

The only problem we encountered was that HLTScalers was waiting to book some histograms up to the moment it was analyzing the first event in a run. Because it was using the size of the hltResult to book the histograms.
We solved this by using the size of the hltConfig instead at booking time.
This was explicitly tested by comparing the resulting numbers from both methods.

[cmsbuild]

A new Pull Request was created by @vanbesien (Broen van Besien) for CMSSW_7_4_X.

Migrating TrigXMonitor to new DQM API

It involves the following packages:

DQM/TrigXMonitor

@cmsbuild, @danduggan, @nclopezo, @deguio 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.
You can reject by replying to this message having '-1' in the first line of your reply.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.

[deguio]

test please

[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes or unless it breaks tests.

[cmsbuild]

+1
Tested at: 1232adf
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7275/2008/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request will be automatically merged.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7275/2008/summary.html