zdtm.sh: dump traffic for *tcpbuf* tests
zdtm.sh: dump traffic for *tcpbuf* tests

Sometimes these tests don't pass successfully and we need more
information to investigate the problem.

https://bugzilla.openvz.org/show_bug.cgi?id=2676
Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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