Has side effect of constraining dmz dev entries to the ttyXX convention.

contents start with a '-' test becomes unhappy (since it interprets it
as another option).

cases where we did not previously handle them.
Thanks to Scott Atwood <atwood@cs.stanford.edu> for reminding us of this.

that if a shutdown-less reboot occurs, the next re-seed is not a repeat

use printf(1) here.  This way there is no possibility of format
string problems and we use a shell builtin instead of an external
command.

inspiration from dynamo@ime.net.
also a typo fix.

may be no /etc/mail/sendmail.cf so don't include that in the check
for whether or not to run /usr/sbin/sendmail.  Instead, check for
the existence of /etc/mailer.conf.  Pointed out by Theo.

-q flag to ls(1) so that non-printable characters will appear as '?'. This
prevents a malicious user from fooling the administrator into thinking the
contents of a file name are actually valid script output (note that you can
put newlines in file names); deraadt@ ok

need to add it.

xterm or equivalent

is used as that device. ttyEcfg needs to be created for wscons tools.
Additional cleanup and comments.