tarantool / tarantool / 15590

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iproto: close socket explicitly before wal_dir at exit

tarantool instance didn't close socket explicitly
which could cause hot standby instance to fail to bind
in case it tries to bind before socket is closed by OS.
Now it is fixed by closing socket explicitly before wal_dir.

Closes #3967

(cherry picked from commit 305dbcf68)

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