MET bugfix for miniAOD + addition of caloMET in slimmedMET for CMSSW 75X

[mmarionncern]

Same as #8159 for 75X

[cmsbuild]

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

MET bugfix for miniAOD + addition of caloMET in slimmedMET for CMSSW 75X

It involves the following packages:

DataFormats/PatCandidates
PhysicsTools/PatAlgos
PhysicsTools/PatUtils

@cmsbuild, @vadler, @nclopezo, @monttj can you please review it and eventually sign? Thanks.
@rappoccio, @imarches, @ahinzmann, @acaudron, @TaiSakuma, @jdolen, @nhanvtran, @schoef, @ferencek, @mariadalfonso, @pvmulder this is something you requested to watch as well.
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@nclopezo you are the release manager for this.
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[cmsbuild]

+1
Tested at: 5d4033a
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8219/3336/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8219/3336/summary.html