fix(network): never reconnect bootstrap again after failure (nervosne…

…twork#22)

* fix(network): never re-connect to bootstrap after connection failure

Should not remove bootstrap peers

* fix(network): warning on empty no peers array

When no peers array is empty, it means we have connection to requested
peers.

core/network/src/peer_manager/mod.rs

@@ -784,7 +784,9 @@ impl PeerManager {
             }
         }
 
-        warn!("network: no peers {:?}", no_peers);
+        if !no_peers.is_empty() {
+            warn!("network: no peers {:?}", no_peers);
+        }
 
         // Send message to connected users
         let tar = TargetSession::Multi(connected);
@@ -921,6 +923,7 @@ impl PeerManager {
 
                 if self.bootstraps.contains(&addr) {
                     error!("network: unconnectable bootstrap address {}", addr);
+                    return;
                 }
 
                 self.inner.try_remove_addr(&addr);