Ecal DQM update

[yiiyama]

This update is a major restructuring of the ECAL DQM code. Each "task" was previously defined as independent EDAnalyzer and was repeated for EB and EE; now there is only one EDAnalyzer for the DQM source and one for the client, and the individual tasks are called by the analyzer as worker sub-modules. This eliminates the repetition of common procedures (setting up the monitor elements, retrieving the collection from Event, etc.) among the tasks, and makes the development and management of the code simpler.
There is little change in terms of the quantities being monitored, but the appearance of some plots change as empty, unfilled bins were removed. Also, calibration-related histograms were taken out of the standard offline DQM sequence as they also were permanently empty.
A technical documentation is being prepared in https://twiki.cern.ch/twiki/bin/viewauth/CMS/EcalDQMDevelopmentManual

[cmsbuild]

A new Pull Request was created by @yiiyama (Yutaro Iiyama) for CMSSW_7_1_X.

Ecal DQM update

It involves the following packages:

DQM/EcalBarrelMonitorClient
DQM/EcalBarrelMonitorDbModule
DQM/EcalBarrelMonitorTasks
DQM/EcalCommon
DQM/EcalEndcapMonitorTasks
DQMOffline/Configuration
DQMOffline/Ecal

@ojeda, @danduggan, @rovere, @cmsbuild, @nclopezo, @deguio, @Degano can you please review it and eventually sign? Thanks.
@argiro this is something you requested to watch as well.
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
When I ran the RelVals I found an error in the following worklfows:
8.0 step3

runTheMatrix-results/8.0_BeamHalo+BeamHalo+DIGICOS+RECOCOS+ALCABH+HARVESTCOS/step3_BeamHalo+BeamHalo+DIGICOS+RECOCOS+ALCABH+HARVESTCOS.log

you can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2735/373/summary.html

[yiiyama]

The cosmic MC sequence failed because DQMOffline.Configuration.DQMOfflineCosmics_Harvesting_cff was referencing EB and EE certification tasks, which do not exist any more (merged to ECAL certification). Fixed by commit be8d2ac

[cmsbuild]

Pull request #2735 was updated. @ojeda, @danduggan, @rovere, @cmsbuild, @nclopezo, @deguio, @Degano can you please check and sign again.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2735/377/summary.html

[deguio]

+1
this has been presented and discussed at the DQM meeting [1]. it is a major change and was tested already since 2012 in the online.

[1]
https://indico.cern.ch/event/294170/contribution/3/material/slides/0.pdf

[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?