[cddlm] updated api test doc

[Steve Loughran]

I've updated the api test doc in CVS; please check it out with a 
non-anonymous account, as sourceforge's public repository mirror is out 
of sync with the developer once since the big filesystem corruption 
event earlier this month.

it now says that you need to spin on waiting for things to become 
unavailable after a destroy, and that there is no single way to 
determine whether an endpoint no longer exists; 404, SOAPFault and 
WSRF-RP:NoSuchResource are all implicitly correct.

-steve