new logo screen saver

[Justin C. Sherrill]

Matthew Dillon wrote:

>     Renaming it is fine.  We don't have to scrap the old logo, but I
>     reserve the right to draw a mustache on it at some future date :-)
>     David, could you handle the commits?

I assume someone (David?) has to do the renaming for the old logo.  Should I
add the DragonFly logo as src/sys/dev/misc/syscons/dflogo or should it
become the new logo_saver?