[MERGE] GSSAPI Authentication support for HTTP

[Jelmer Vernooij]

The attached patch adds support for WWW-Authenticate: Negotiate using
Kerberos (GSSAPI). 

I've tested it here locally against a couple of servers, but it's hard
to do automated tests, as setting up a KDC + mod_auth_kerberos is
nontrivial. 

Since this code is only executed for "WWW-Authenticate: Negotiate", it
can potentially only break in situations that didn't work previously
anyway.

At the moment, it's necessary to specify a username in the URL as bzr
requires it for authentication, even though this is not required by
Kerberos/GSSAPI. The specified username is ignored.

Cheers,

Jelmer
-- 
Jelmer Vernooij <jelmer at samba.org> - http://samba.org/~jelmer/
Jabber: jelmer at jabber.fsfe.org
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