hs-v3: Downgrade warning log when an intro circuit has closed

When an intro circuit has closed, do not warn anymore when we can't find the
service. It is possible to hit that condition if the service is removed before
the circuits were fully closed. This happens in the case of deleting an
ephemeral service.

Signed-off-by: David Goulet <dgoulet@torproject.org>

src/or/hs_service.c

@@ -3079,7 +3079,9 @@ hs_service_intro_circ_has_closed(origin_circuit_t *circ)
 
   get_objects_from_ident(circ->hs_ident, &service, &ip, &desc);
   if (service == NULL) {
-    log_warn(LD_REND, "Unable to find any hidden service associated "
+    /* This is possible if the circuits are closed and the service is
+     * immediately deleted. */
+    log_info(LD_REND, "Unable to find any hidden service associated "
                       "identity key %s on intro circuit %u.",
              ed25519_fmt(&circ->hs_ident->identity_pk),
              TO_CIRCUIT(circ)->n_circ_id);