dump: Fix task freezing process
dump: Fix task freezing process

Currently we read the children tree of running processes.
This is deadly wrong. Stop task once we open it's proc dir
before descending to its kids.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>
Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>

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