zdtm/socket_close_data01: wait a child before c/r
zdtm/socket_close_data01: wait a child before c/r

A static test should not change its state during C/R.

Signed-off-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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