director: Fix rapid reconnection on failed outgoing connections

last_network_failure wasn't set, which caused a failed outgoing connection
to immediately reconnect to it. This resulted in rapid logging of
connect() errors.

src/director/director-connection.c

@@ -2167,7 +2167,8 @@ static void director_connection_disconnected(struct director_connection **_conn,
 	struct director_connection *conn = *_conn;
 	struct director *dir = conn->dir;
 
-	if (conn->connected_time.tv_sec + DIRECTOR_SUCCESS_MIN_CONNECT_SECS > ioloop_time &&
+	if ((conn->connected_time.tv_sec == 0 ||
+	     conn->connected_time.tv_sec + DIRECTOR_SUCCESS_MIN_CONNECT_SECS > ioloop_time) &&
 	    conn->host != NULL) {
 		/* connection didn't exist for very long, assume it has a
 		   network problem */