Remove all dependancies newfs had on accessing the disklabel. Use

Remove all dependancies newfs had on accessing the disklabel.  Use
getdisktabbyname() instead of getdiskbyname() and use DIOCGPART instead
of DIOCGDINFO to get the geometry information.  Also make the -v option
work properly with regular files.

NOTE: newfs will no longer retrieve the fs fragment and block size fields
from the disklabel, so non-default operation must be specified with options.
newfs will also no longer attempt to update the disklabel.