added rationale for doing upload_metadata and download_metadata as [client_implemented] functions
added rationale for doing upload_metadata and download_metadata as [client_implemented] functions

kbase/handle_service,sjyoo/handle_service,sjyoo/handle_service,kbase/handle_service,sjyoo/handle_service,kbase/handle_service,sjyoo/handle_service,kbase/handle_service,kbase/handle_service