now that the generic exception code is a separate library in the isc namespace
it doesn't make sense to call it dns_something.
I know it's a big change, but I believe we should do this cleanup sooner
than later.


git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1181 e5f2f494-b856-4b98-b285-d166d9295462