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Implement TCP graceful shutdown in lifecycle interface. #719

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@levy levy commented Sep 9, 2021

This change was created during the 2021 summit. It's incomplete, see the comments.

…onnections and waits for the close to be finished.

TelnetApp is modified to test this with shutdownrestart example, this modification is not needed

Open questions:
 - what happens with the callback to the application (which is already stopped) when
the socket is closed? Currently it causes an error.
 - TCP starts a very long timeout (120s) after receiving the FIN bit, so the connection to be removed takes a lot of time
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