of the new fs has uid.gid equal to the euid.egid of the process
which made it. This change permits users who have write access to
a device (say a floppy) to create a filesystem that, when mounted,
they have write access to.
This change closes PR bin/5990 from jbernard@ox.mines.edu, and is also the
change requested in PR bin/6276 from "Charles M. Hannum" <mycroft@netbsd.org>