Migration from GeoModelKernelUnits to Gaudi::Units in three GeoModel packages

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-GeoModel-units into master

Three packages have been migrated: GeoModelSvc, GeoModelUtilities and GeoModelExamples. The only exception from this migration is GeoModelKernelUnits::gram, because the migration to Gaudi::Units::gram changes the output of simulation jobs. The reason for that is the difference between definitions of e_SI constant in GeoModel/CLHEP and Gaudi

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