fix to run Z->mumu alignment validation

[scasasso]

Some fixes to run the Z->mumu alignment validation on 71X and SLC6 machines

[cmsbuild]

A new Pull Request was created by @scasasso (Stefano Casasso) for CMSSW_7_1_X.

fix to run Z->mumu alignment validation

It involves the following packages:

Alignment/OfflineValidation

@diguida, @cerminar, @cmsbuild, @nclopezo, @rcastello, @mmusich can you please review it and eventually sign? Thanks.
@ghellwig, @mmusich, @frmeier, @tlampen this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@Degano you are the release manager for this.
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[cmsbuild]

+1
Tested at: 77d7a3b
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6558/1108/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6558/1108/summary.html

[mmusich]

This is a backport of the fix recently introduced in 73X ( #6233)

[mmusich]

+1
Same as #6233

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @ktf, @smuzaffar

[davidlange6]

+1