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Add profilable configurable setting for vdo pool header size, that is used as 'extra' empty space at the front and end of vdo-pool device to avoid having a disk in the system the may have same data is real vdo LV. For some conversion cases however we may need to allow using '0' header size. TODO: in this case we may eventually avoid adding 'linear' mapping layer in future - but this requires further modification over lvm code base.