New option for newfs(3) to make life with GEOM easier

[Peter Schuller]

> In some scenarios, it can be desirable to newfs first, geom later.

In particular, moving to root-on-gmirror or root-on-glabel after an 
installation using standard FreeBSD installation media. Not having to jump 
between two disks or otherwise jumping through hoops would be very nice. A 
newfs arg would be controllable through the standard installer, thus  making 
this a lot easier.

-- 
/ Peter Schuller

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