fix sysinfo update when id change, and add debug info for pk change

libs/hbb_common/src/config.rs

@@ -867,6 +867,7 @@ impl Config {
         }
         let mut config = Config::load_::<Config>("");
         if config.key_pair.0.is_empty() {
+            log::info!("Generated new keypair for id: {}", config.id);
             let (pk, sk) = sign::gen_keypair();
             let key_pair = (sk.0.to_vec(), pk.0.into());
             config.key_pair = key_pair.clone();