protobuf: Cleanup typedefs a bit

No need to pollute typedef out of structure
statement since we don't use it in that form.
Simply typedef in place. And align members
while we're at it.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>