[simulated omicron] Display sled agent address (#9539)

This patch adds the sled agent address to the initial output when
starting up a simulated omicron.

Author: karencfv

dev-tools/omicron-dev/src/main.rs

@@ -120,6 +120,10 @@ impl RunAllArgs {
             "omicron-dev: nexus lockstep API:     {:?}",
             cptestctx.server.get_http_server_lockstep_address(),
         );
+        println!(
+            "omicron-dev: sled agent API:         http://{:?}",
+            cptestctx.sled_agents[0].local_addr(),
+        );
         println!(
             "omicron-dev: cockroachdb pid:        {}",
             cptestctx.database.pid(),