add support for defining global host info

Change the '*' in the node info update cmd to refer to host info instead

Signed-off-by: Felix Fietkau <nbd@nbd.name>

main.c

@@ -26,6 +26,7 @@
 
 struct ubus_context *ubus_ctx;
 struct usteer_config config = {};
+struct blob_attr *host_info_blob;
 uint64_t current_time;
 
 LIST_HEAD(node_handlers);