code: def provider_parser(subparser):
      
      subparser.add_argument(
          "--auth-account", help="specify account number for authentication")
      subparser.add_argument(
          "--auth-username",
          help="specify username for authentication. Only used if --auth-token is empty.")
      subparser.add_argument(
          "--auth-api-key",
          help="specify api key for authentication. Only used if --auth-token is empty.")
      subparser.add_argument(
          "--auth-token",
          help=("specify token for authentication. "
                "If empty, the username and api key will be used to create a token."))
      subparser.add_argument("--sleep-time", type=float, default=1,
                             help="number of seconds to wait between update requests.")
docs: Configure provider parser for Rackspace