Creates default jobs (background instances) for a specified machine with the given parameters.
CLI Usage: vastai set defjob <machine_id> --price_gpu <price> --price_inetu <price> --price_inetd <price> --image <image> [--args <args>]
vastai set defjob <machine_id> --price_gpu <price> --price_inetu <price> --price_inetd <price> --image <image> [--args <args>]