Cleanup and add self tests for utils.MultiSrcConf
- Remove redundant information exposed in
YAML_MAP_TOP_LEVEL_KEYand the actual top-level key descriptor inSTRUCTURE - Add self tests for
utils.MultiSrcConf(along withTargetConfandPlatformInfo)
YAML_MAP_TOP_LEVEL_KEY and the actual top-level key descriptor in STRUCTURE
utils.MultiSrcConf (along with TargetConf and PlatformInfo)