Fix thread saferty warnings of PixelRTT package.

Susumu Odarequested to merge
oda/athena:master-PixelConditionsData-v2 into master
  • Fix thread saferty warnings of PixelRTT package.
    • Add ATLAS_NOT_THREAD_SAFE to ResPullValidation::Write and CosmicTrackValidation::Write because thread unsafe MultiHisto::Write method is used.
  • No result changes are expected.
  • No JIRA ticket

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