Add ATLAS_CHECK_THREAD_SAFETY to PixelConditionsData with fixing constness issues.

Susumu Odarequested to merge
oda/athena:master-PixelConditionsData into master
  • In order to confirm and keep thread safety of the PixelConditionsData package, ATLAS_CHECK_THREAD_SAFETY file was added.
  • Some changes were necessary
    • Add const to getter methods
    • Add const to return type of const methods
    • Prepare both const and non-const getter methods if necessary
    • Add const to a static variable
  • Results should not be changed.
  • No JIRA ticket
Edited by Susumu Oda

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