Implemented new endpoint for project creation using apigen.
Implemented new service method compatible with new generated api.
Change-Id: I2bae22c8b046f21ec5bb6522f09b9c4e74bdba0c
Added new endpoint to get project's single bucket usage rollup.
Extended generation code to handle service method args.
Change-Id: Ief768632a801c047c66e0617056fbd7b30427b33