Merge "Expose SocketKeepalive#SUCCESS as SystemApi" am: 7e7cd3b0d4 am: 43d6fdf6f8

Change-Id: If67241a41678690a63a9cc20d2125fc2ee90ada6
tree: d5dbfdcdfbe6ed3b29a78d3f85047f3803c342f3
  1. core/
  2. services/
  3. tests/