Migrated from GeoModelKernelUnits to Gaudi::Units in three packages under AtlasGeometryCommon

This merge request affects 3 packages:

• AtlasGeometryCommon/BeamPipeGeoModel
• AtlasGeometryCommon/CavernInfraGeoModel
• AtlasGeometryCommon/GeoModelEnvelopes

added Geometry master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20463-2019-01-20-14-40
Athena: number of compilation errors 0, warnings 36
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 32447] (for remote access see the FAQ for MR reviewers)

Simple changes, approving....

Pavol [as L2 MR shifter]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 9596a017

added sweep:ignore label