moving HIPixelMedianVtxProducer to legacy

[ginnocen]

Moving HIPixelMedianVtxProducer to legacy to avoid multi-thread error for HLT tracking

[cmsbuild]

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

It involves the following packages:

RecoHI/HiTracking

@cmsbuild, @cvuosalo, @davidlange6, @slava77 can you please review it and eventually sign? Thanks.
@jazzitup, @dgulhan, @echapon, @yenjie, @kurtejung, @istaslis, @mandrenguyen, @richard-cms, @yetkinyilmaz this is something you requested to watch as well.
@Degano you are the release manager for this.

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[slava77]

@cmsbuild please test

@ginnocen
please provide details how to check the issue observed in MT setup in HLT.

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/9767/console

[cmsbuild]

+1
Tested at: e7342cf
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12448/9767/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12448/9767/summary.html

[slava77]

+1

for #12448 e7342cf

• formal regression back to the legacy module to resolve the issue running multithreaded (more details in https://hypernews.cern.ch/HyperNews/CMS/get/hlt/4107/4/1/1/1/2/1/1/1/1/1.html)
• jenkins tests pass and comparisons with baseline show no differences

There is no need to make the same regression in 76X/80X: the issue there is expected to be fixed more appropriately.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_7_6_X is complete. This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar