The issue in this PR is resolved by setting the sector size using vnconfig and then mounting it normally.
What remains is how to specify this when using the rump. mount_udf(8) has no option to set the sector size since its size is dictated by the media as per UDF specification and is inquired on mount time. Since RUMP is providing the image as a device, its up to RUMP to specify this correctly. Reinoud
