Remove hardcoded InputTag in PATPhotonProducer (same as #7946 , rebased on smth later)

[slava77]

(copy-pasting from #7946)

The hardcoded inputtag were preventing the electronVeto in miniAOD to work properly. Different superClusterRefs for (slimmedPhotons and gedGsfElectrons) were indeed compared returning identically false.
Changed accordingly the configuration to produce miniAOD.

[cmsbuild]

A new Pull Request was created by @slava77 (Slava Krutelyov) for CMSSW_7_4_X.

Remove hardcoded InputTag in PATPhotonProducer (same as #7946 , rebased on smth later)

It involves the following packages:

PhysicsTools/PatAlgos

@cmsbuild, @vadler, @nclopezo, @monttj can you please review it and eventually sign? Thanks.
@rappoccio, @imarches, @ahinzmann, @acaudron, @mmarionncern, @jdolen, @nhanvtran, @schoef, @ferencek, @mariadalfonso, @pvmulder, @TaiSakuma this is something you requested to watch as well.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 17dbcdb
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8505/3774/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8505/3774/summary.html