Fix HO timing monitoring

[akhukhun]

Fixing the HO timing monitoring and adding a couple of timing histograms.

[cmsbuild]

A new Pull Request was created by @akhukhun for CMSSW_7_3_X.

Fix HO timing monitoring

It involves the following packages:

DQM/HcalMonitorTasks
DQM/Integration

@nclopezo, @danduggan, @rovere, @cmsbuild, @deguio, @ojeda can you please review it and eventually sign? Thanks.
@batinkov this is something you requested to watch as well.
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@nclopezo, @ktf you are the release manager for this.
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[cmsbuild]

+1
Tested at: b84fde0
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6052/457/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6052/457/summary.html

[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_3_X IBs unless changes (tests are also fine). This pull request will be automatically merged.