[RADIATOR] Handler code for Access-Reject

[Carl Gibbons]

What's the simplest way to code a <Handler> that always rejects an  
Access-Request?

The primary goal is to have this 'reject-by-default' handler at the  
bottom of the config file, so that if an Access-Request isn't matched  
by a more specific handler earlier in the config, then it's  
automatically rejected by the this one. A secondary goal is to have  
the reject-by-default handler put an attribute in the Access-Reject  
that distinguishes its rejection from those that an earlier handler  
may yield.

- Carl Gibbons