Reorganise AthenaConfiguration unit tests

Control/AthenaConfiguration/CMakeLists.txt

Control/AthenaConfiguration/python/AllConfigFlags.py

Control/AthenaConfiguration/python/GeoModelConfigFlags.py

Control/AthenaConfiguration/test/testAllConfigFlags.py

...rol/AthenaConfiguration/test/testAllConfigFlags_AOD_MC.py

...l/AthenaConfiguration/test/testAllConfigFlags_AOD_data.py

Control/AthenaConfiguration/test/testAllConfigFlags_EVNT.py

Control/AthenaConfiguration/test/testAllConfigFlags_HITS.py

Control/AthenaConfiguration/test/testAllConfigFlags_RDO.py

Control/AthenaConfiguration/test/testAthConfigFlags.py

Control/AthenaExamples/AthExUnittest/CMakeLists.txt

Projects/AthAnalysis/package_filters.txt

Projects/AthGeneration/package_filters.txt

Projects/AthSimulation/package_filters.txt

Simulation/SimulationConfig/python/SimConfigFlags.py