mount: Dump/restore devtmpfs if it's virtualized
mount: Dump/restore devtmpfs if it's virtualized

In case if we meet virtualized devtmpfs on dump
(which means its s_dev is different from one obtained
 during mountpoints dump procedure) we should dump it
with tar help. Thus on restore it get filled from the
image.

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

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