made rrclass private.

in general we should avoid non-private member variables whenever possible
for various reasons.  and, in this case we can actually make it private
as we provide the accessor member function.


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/parkinglot@716 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/auth/cpp/data_source.h

@@ -101,7 +101,7 @@ public:
     DSResult init() { return NOT_IMPLEMENTED; }
     DSResult close() { return NOT_IMPLEMENTED; }
 
-protected:
+private:
     RRClass rrclass;
 };