ZookeeperDiscoveryImpl#cleanupPreviousClusterData can delete alive node of a client in case of low internal order.
Steps to reproduce:
1. Start server and client.
2. Stop the server and wait for the client disconnected.
3. Start and stop the server. The server hasn't time to process client join request.
4. Start server. It will delete alive client node because the client has low internal order. The client will never connect.
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