SUJ update

[Ed Maste]

On Mon, May 03, 2010 at 04:32:37PM -0700, Doug Barton wrote:

> I also don't want to bikeshed this to death. I imagine that once the
> feature is stable that users will just twiddle it once and then leave it
> alone, or it will be set at install time and then not twiddled at all. :)

Speaking of which, is there any reason for us not to support enabling SU+J
at newfs time?  (Other than just needing a clean way to share the code
between tunefs and newfs.)

-Ed