[Vortex] pull api + tls, missing connection closed event

[DEXTER]

Hi Francis,

It seems that when using TLS + PULL api there's no event notification
about the connection closed event.

I've created (copied) a simple server/client (attached), where you can
try this out.

If you start both, and while the client is running, you terminate the
server (Ctrl+c) you'll see there will be no connection closed event on
the client side.

while if you comment out the vortex_connection_start_negotiation_sync
in the client.c and repeat the above process, you'll see that the
client receives the connection closed event.
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