only use alive paths for lookups

only track usage from sessions and don't care about intro timeouts

llarp/service/endpoint_util.hpp

@@ -50,7 +50,7 @@ namespace llarp
       {
         --tries;
         const auto path = ep->PickRandomEstablishedPath();
-        if (path)
+        if (path and path->IsReady())
           paths.emplace(path);
       } while (tries > 0 and paths.size() < N);
       return paths;

llarp/service/session.cpp

@@ -27,7 +27,7 @@ namespace llarp
       const auto lastUsed = std::max(lastSend, lastRecv);
       if (lastUsed == 0s)
         return intro.IsExpired(now);
-      return now > lastUsed && (now - lastUsed > lifetime || intro.IsExpired(now));
+      return now > lastUsed && now - lastUsed > lifetime;
     }
 
     void