protobuf: move data pointer to field structure
protobuf: move data pointer to field structure

Signed-off-by: Stanislav Kinsbursky <43b28e187c4fe6e53d7ab0bb71957481e322f182@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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