Notify the client when the server host or the nxserver are rebooting or shutting down

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This Feature Request is superseded by https://www.nomachine.com/FR02S04073

Notifying the client when the remote session is terminated without user's intervention

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Currently when the nxserver or the server host are being restarted or shut down, sessions are gracefully closed and the NoMachine client goes back to the list of favorite connections.

The server should tell the client what is happening before the session terminates. With this information the client could enter the automatic reconnection procedure, or show a message to the user to explain why the session closed.