Add vertex smearing parameters as measured during Run2015A (0T) and Run2015B (3.8T)

[diguida]

This PR adds two sets of vertex smearing parameters:

• Realistic50ns13TeVCollisionZeroTesla: it contains the values computed from Run2015A luminous region with 0T data and alignment for first collisions (see Vtx smearing parameters for realistic 50ns collisions 13 TeV #10222 );
• Realistic50ns13TeVCollision: it contains the values computed from Run2015B luminous region with 3.8T data and PCL-like alignment (see [IOMC]: update vertex smearing parameters for realistic 13 TeV 50ns collisions #10384 ). The sigmaZ value is still set to the "original" value of 5.3 cm, while 2015B data indicate that it is actually shrunk to ~4.3 cm: it is pending discussion with LHC OP.

[diguida]

@mmusich @cerminar this is something you might want to watch as well.

[cmsbuild]

A new Pull Request was created by @diguida (Salvatore Di Guida) for CMSSW_7_6_X.

Add vertex smearing parameters as measured during Run2015A (0T) and Run2015B (3.8T)

It involves the following packages:

Configuration/StandardSequences
IOMC/EventVertexGenerators

@cmsbuild, @civanch, @franzoni, @mdhildreth, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @makortel, @GiacomoSguazzoni, @rovere, @VinInn, @Martin-Grunewald, @cerati, @dgulhan 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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[diguida]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10435/191338/summary.html