Bug#313560: /dev/{null,zero,full} should not be run as root

["Neal H. Walfield" <neal@walfield.org>]

Package: Hurd

/dev/{null,zero,full} should not be run as root: they don't need root
access to operate correctly.  Because they are translators and the
node is owned by root, the file system starts them with root
permission.  Ideally, they should be run with no user ids but as an
interim measure, they can be run as nobody.

Thanks,
Neal