Extend PoolFilePeeker so that it can check other IOVMetaDataContainers

John Derek Chapmanrequested to merge
jchapman/athena:ExtendPoolFilePeeker_master into master

Added ability for PoolFilePeeker to examine /Generation/Parameters, /Simulation/Parameters and /Digitization/Parameters IOVMetaDataContainers. Added the ability to return the TRTRangeCut value from /Simulation/Parameters (if it is present) as a proof of principle as this variable is needed in the TRT Digitization configuration.

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