mount: mark all mounts as private in one place
mount: mark all mounts as private in one place

This should be done before restoring a mount tree. This patch is a part
of the series about moving pivot_root, which has been committed.

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

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