1. Add skyline-config unit test case and tools 2. Update immutables package type annotation 3. Adjust get_config_path function Change-Id: Idc70ac164247c0d9cd5135f4e5bbef3994d05f22
1. remove base.py under config folder 2. add skyline-config library under libs Change-Id: I71561bc3f6acbff3d90c9ad1922095e71497f226