QUIC: "info" logging level on insufficient client connection ids.

Apparently, this error is reported on NAT rebinding if client didn't
previously send NEW_CONNECTION_ID to supply additional connection ids.

src/event/quic/ngx_event_quic_migration.c

@@ -309,7 +309,7 @@ ngx_quic_set_path(ngx_connection_t *c, ngx_quic_header_t *pkt)
     /* new path requires new client id */
     cid = ngx_quic_next_client_id(c);
     if (cid == NULL) {
-        ngx_log_error(NGX_LOG_ERR, c->log, 0,
+        ngx_log_error(NGX_LOG_INFO, c->log, 0,
                       "quic no available client ids for new path");
         /* stop processing of this datagram */
         return NGX_DONE;