lib/connections: Relay failures should be informative, not warning

Skip-check: authors

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3263

AUTHORS

@@ -12,6 +12,7 @@ Alexander Graf (alex2108) <[email protected]>
 Alexandre Viau (aviau) <[email protected]> <[email protected]>
 Anderson Mesquita (andersonvom) <[email protected]>
 Andrew Dunham (andrew-d) <[email protected]>
+Andrey D (scienmind) <[email protected]>
 Antony Male (canton7) <[email protected]>
 Arthur Axel fREW Schmidt (frioux) <[email protected]> <[email protected]>
 Audrius Butkevicius (AudriusButkevicius) <[email protected]>

lib/connections/relay_listen.go

@@ -69,7 +69,7 @@ func (t *relayListener) Serve() {
 
 			conn, err := client.JoinSession(inv)
 			if err != nil {
-				l.Warnln("Joining relay session (BEP/relay):", err)
+				l.Infoln("Joining relay session (BEP/relay):", err)
 				continue
 			}