enable MiniAOD validation, change GenJets to genJetsNoNu for default validation

[webermat]

...validations.
Includes a fix for the previous PR #8504

The MiniAOD validation modules are now put in file
Configuration/StandardSequences/python/Validation_cff.py
into validationMiniAOD instead of the prevalidationMiniAOD sequence

Reorganisation for the MET Harvesting to include a PostProcessor for an overall MET Resolution summary plot and a MET PostProcessorHarvester to compare output of RECO and MiniAOD validations.

Tested successfully locally using the mentioned unscheduled Validation
runTheMatrix.py -l 11325 -i all

[cmsbuild]

A new Pull Request was created by @webermat for CMSSW_7_5_X.

modifications to enable MiniAOD validation and compare RECO and MiniAOD ...

It involves the following packages:

Configuration/StandardSequences
Validation/Configuration
Validation/RecoJets
Validation/RecoMET

@civanch, @nclopezo, @cvuosalo, @mdhildreth, @cmsbuild, @franzoni, @deguio, @slava77, @danduggan, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @appeltel, @mmarionncern, @jdolen, @ahinzmann, @GiacomoSguazzoni, @rappoccio, @rovere, @VinInn, @Martin-Grunewald, @makortel, @nhanvtran, @schoef, @cerati, @mariadalfonso, @dgulhan, @TaiSakuma this is something you requested to watch as well.
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[cmsbuild]

+1
Tested at: ed7c357
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8672/4113/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8672/4113/summary.html

[slava77]

I thought this PR was supposed to modify only miniAOD-related parts of the code, not the standard validation sequence.

Matthias, please update the PR subject and description (at the top of the PR page).
We should not bury default jet collection changes in seemingly unrelated PR names

[slava77]

+1

for #8672 10a17d1

• compared to the last sign-off 5721562, input jet collections were changed in the standard validation sequence
• jenkins tests pass ok; comparisons with the baseline show differences in jet plots as expected from the change in the jet collection input
• tested workflow 11325 (it includes miniAOD) locally in CMSSW_7_5_X_2015-05-23-1100 /test area test8672/: miniAOD and jet validation plots have changed in a minor way (as expected for ak4GenJets -> ak4GenJetsNoNu switch).