Report host power state in Redfish chassis response

kestrel/src/redfish.c

@@ -322,7 +322,12 @@ int redfish_v1_system_endpoint_handler(struct mg_connection *conn, void *cbdata)
 	redfish_system_data_list.id = "system";
 	redfish_system_data_list.indicator_led = "Off";
 	redfish_system_data_list.name = "Computer System";
+	if (host_power_status == HOST_POWER_STATUS_OFFLINE) {
 		redfish_system_data_list.power_state = "Off";
+	}
+	else {
+		redfish_system_data_list.power_state = "On";
+	}
 	redfish_system_data_list.status.state = "Enabled";
 	redfish_system_data_list.system_type = "Physical";
 
@@ -457,6 +462,6 @@ int redfish_v1_system_reset_endpoint_handler(struct mg_connection *conn, void *c
 	mg_printf(conn, "%s", json_string_buffer);
 
 	SEND_STANDARD_FOOTER(conn);
-// 
+
 	return 200;
 }