hosts: don't allow manual peers to enter the hostlist via other peers

Storing manual peers on the hostlist creates redundancy since we can
never connect to them in Outbound Session or refine them in Refine
Session, so they just pointlessly sit on our greylist forever.

src/net/hosts.rs

@@ -1142,6 +1142,15 @@ impl Hosts {
                 continue
             }
 
+            // Configured peers should not enter the hostlist.
+            if settings.peers.contains(addr_) {
+                debug!(
+                    target: "net::hosts::filter_addresses",
+                    "[{}] is a configured peer. Skipping", addr_,
+                );
+                continue
+            }
+
             // Blacklist peers should never enter the hostlist.
             if self.container.contains(HostColor::Black as usize, addr_) ||
                 self.block_all_ports(addr_.host_str().unwrap().to_string())