[MERGE] Allow HTTP authentication handlers (such as the NegotiateAuthHandler) to

[John Arbash Meinel]

John Arbash Meinel has voted tweak.
Status is now: Conditionally approved
Comment:
Do I understand that the *base* implementation now claims 
"requires_username = False" ? (It is a bit hard to tell from the diff.)

I would probably default to True, as it seems more likely.

Any chance you could add a test for this ? (That if 'requires_username = 
False' we don't ask for a username when authenticating and still 
authenticate ?)

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C20090218183549.D27DD572E1%40charis.vernstok.nl.vernstok.nl%3E
Project: Bazaar