Fix sigmaIetaIphi for photon regression (76X)

[lgray]

Forward port of #11403.

[lgray]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

A new Pull Request was created by @lgray (Lindsey Gray) for CMSSW_7_6_X.

Fix sigmaIetaIphi for photon regression (76X)

It involves the following packages:

RecoEgamma/EgammaTools

@cmsbuild, @cvuosalo, @slava77 can you please review it and eventually sign? Thanks.
@Sam-Harper this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[cmsbuild]

+1
Tested at: 3e660e3
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11408/8256/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11408/8256/summary.html

[slava77]

@lgray please close this PR, it looks like it's superseded by #11367

[lgray]

Done.