Remove explicit enum support in AthConfigFlag and use type

Control/AthenaConfiguration/python/AllConfigFlags.py

Control/AthenaConfiguration/python/AnalysisApp.py

Control/AthenaConfiguration/python/AthConfigFlags.py

Control/AthenaConfiguration/python/GeoModelConfigFlags.py

Control/AthenaConfiguration/test/testAthConfigFlags.py

Control/AthenaMonitoring/python/DQConfigFlags.py

LArCalorimeter/LArConfiguration/python/LArConfigFlags.py

MuonSpectrometer/MuonConfig/python/MuonConfigFlags.py

Reconstruction/RecJobTransforms/python/RecoConfigFlags.py

Simulation/Digitization/python/DigitizationConfigFlags.py

Simulation/SimulationConfig/python/SimConfigFlags.py

Tracking/Acts/ActsConfig/python/ActsConfigFlags.py

Tracking/TrkConfig/python/TrkConfigFlags.py

Tracking/TrkConfig/python/VertexFindingFlags.py