tarantool / tarantool / 14772

83%

master: 87%

push

travis-ci

iproto: fire on_disconnect right after disconnect

Before the patch on_disconnect triggers were called
only after last outstanding request had finished. It
was enough for most goals. But after box.session.push
was implemented, it appeared that it is impossible to
return an error from push() if a connection is closed.

Tx session just does not know that a connection is
already closed. The patch splits destroy and
disconnect phases of an iproto connection lifecycle.
Disconnect calls on_disconnect triggers and resets
iproto socket fd. Destroy frees resources.

Needed for #3859

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