omicron-dev should run simulated sled agent with `SimMode::Auto`

[gjcolombo]

The omicron-dev tool runs an in-process simulated sled agent that shares a configuration with the integration tests' configuration:

omicron/nexus/test-utils/src/lib.rs

Lines 220 to 249 in 5d39727

	pub async fn start_sled_agent(
	log: Logger,
	nexus_address: SocketAddr,
	id: Uuid,
	update_directory: &Path,
	) -> Result<sim::Server, String> {
	let config = sim::Config {
	id,
	sim_mode: sim::SimMode::Explicit,
	nexus_address,
	dropshot: ConfigDropshot {
	bind_address: SocketAddr::new(Ipv6Addr::LOCALHOST.into(), 0),
	request_body_max_bytes: 1024 * 1024,
	..Default::default()
	},
	// TODO-cleanup this is unused
	log: ConfigLogging::StderrTerminal { level: ConfigLoggingLevel::Debug },
	storage: sim::ConfigStorage {
	zpools: vec![],
	ip: IpAddr::from(Ipv6Addr::LOCALHOST),
	},
	updates: sim::ConfigUpdates {
	zone_artifact_path: update_directory.to_path_buf(),
	},
	};
	let (server, _rack_init_request) =
	sim::Server::start(&config, &log).await?;
	Ok(server)
	}

This configuration specifies that the simulation should run in Explicit mode. In this mode, simulated objects like instances need to be poked explicitly (by calling the right simulated agent endpoint) to transition between states. For local development purposes, where there's a user playing around with the simulation instead of a test that's poking objects to generate state transitions, it would be nice if the simulation ran in Auto mode to match sled-agent-sim's default behavior.

[davepacheco]

Nice catch. Sorry for missing this and thanks for the report.