Logging adjustment (#585)

* Reduced severity of common harmless warnings

* Changed the same ip node warning

* More explicit error on network address binding failure

mixnode/src/node/listener/mod.rs

@@ -4,6 +4,7 @@
 use crate::node::listener::connection_handler::ConnectionHandler;
 use log::*;
 use std::net::SocketAddr;
+use std::process;
 use tokio::net::TcpListener;
 use tokio::task::JoinHandle;
 
@@ -19,9 +20,14 @@ impl Listener {
     }
 
     async fn run(&mut self, connection_handler: ConnectionHandler) {
-        let listener = TcpListener::bind(self.address)
-            .await
-            .expect("Failed to create TCP listener");
+        let listener = match TcpListener::bind(self.address).await {
+            Ok(listener) => listener,
+            Err(err) => {
+                error!("Failed to bind to {} - {}. Are you sure nothing else is running on the specified port and your user has sufficient permission to bind to the requested address?", self.address, err);
+                process::exit(1);
+            }
+        };
+
         loop {
             match listener.accept().await {
                 Ok((socket, remote_addr)) => {

mixnode/src/node/mod.rs

@@ -128,7 +128,7 @@ impl MixNode {
         runtime.block_on(async {
             if let Some(duplicate_node_key) = self.check_if_same_ip_node_exists().await {
                 if duplicate_node_key == self.identity_keypair.public_key().to_base58_string() {
-                    warn!("We seem to have not unregistered after going offline - there's a node with identical identity and announce-host us as registered.")
+                    warn!("You seem to have bonded your mixnode before starting it - that's highly unrecommended as in the future it will result in slashing");
                 } else {
                     error!(
                         "Our announce-host is identical to an existing node's announce-host! (its key is {:?})",