* Move `wasi` to `wasi_old` in wasi-tests Leave space for the new `wasi` crate but allow us to incrementally update tests. * Update the big_random_buf test * Update clock_time_get test * Update close_preopen test * Review comments * Update to latest Wasmtime API
This is the test-programs crate, which builds and runs whole programs
compiled to wasm32-wasi.