Failing tests on Ubuntu due to known bug in Zookeeper.Client

[HolyPrapor]

The best way to fix these tests is to fix Zookeeper.Client :)

However, that is not trivial.

This means that some nodes may be deleted not immediately, like on Windows, but after some time (next keep-alive ping, which may happen after 10 sec in the worst case).

So one way to fix tests is to put Task.Delay(10 * 1000) and catch up with actual state.

But I don't see any point in fixing tests, not actual problem.

So let this ticket exist while tests fail like an indicator.