8029904: Remove com.sun.security.auth.callback.DialogCallbackHandler

[Alan Bateman]

Thanks for the reviews on this. I see Bernd Eckenfels has suggested 
removed an additional import statement the sasl/digest/NoQuoteParams 
test, no problem, I will do that. He also suggested some clean-up for 
the pkcs11/Provider/Login.java test. That seems reasonable too but 
perhaps a bit beyond the scope of the change here. We can create another 
bug to track cleaning up that test.

-Alan.