namespace: add real pid to nsid
namespace: add real pid to nsid

Before we dumped namespace of the root task only.
Now we are going to dump nested namespaces, so we need to know a pid of
any process, which lives in the target namespace.

Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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