MRG: resolve conflicts between optical and sar IMI

.../OTB/Files/ioTvImageMetadataInterfaceTest_CosmoSkyMed.txt

...ne/OTB/Files/ioTvImageMetadataInterfaceTest_Radarsat2.txt

...ine/OTB/Files/ioTvImageMetadataInterfaceTest_TerraSar.txt

...es/Core/Metadata/include/otbCosmoImageMetadataInterface.h

...ore/Metadata/include/otbRadarsat2ImageMetadataInterface.h

...Core/Metadata/include/otbTerraSarImageMetadataInterface.h

Modules/Core/Metadata/src/CMakeLists.txt

Modules/Core/Metadata/src/otbCosmoImageMetadataInterface.cxx

Modules/Core/Metadata/src/otbImageMetadataInterfaceBase.cxx

Modules/Core/Metadata/src/otbMetaDataKey.cxx

.../Core/Metadata/src/otbRadarsat2ImageMetadataInterface.cxx

...s/Core/Metadata/src/otbTerraSarImageMetadataInterface.cxx

Modules/Core/Metadata/test/CMakeLists.txt