mock unique buildroot extension test

[seth vidal]

On Sat, 2005-06-25 at 12:30 -0400, Dan Williams wrote:
> Hi,
> 
> This patch provides the ability to specify a unique extension to the buildroot 
> directory.  This provides the ability for more than one mock process building 
> the same .cfg file, but isolated from each other.  Useful for build systems :)
> 
> Dan

checked in, thanks.

-sv