10 seconds is apparently not enough on a busy machine: with it I'm seeing
several failures where glog is stuck in fsync flushing its buffers, for
example:

https://nexedijs.erp5.net/#/test_result_module/20210817-E9535884/25
https://nexedijs.erp5.net/#/test_result_module/20210817-130D3B7A2/23
https://nexedijs.erp5.net/#/test_result_module/20210817-130D3B7A2/21
...

let's try to double the timeout.