Kerberos for windows support in Mozilla

[Sam Hartman]

I'd like to echo Doug's comments.  I'm actually not at all sure you'd
want the default to be SSPI if you find a new enough KFW.  The intent
is that KFW will pick up SSPI credentials if necessary/desirable.  I
don't know that we are there yet but should be soon.

We'd be happy to show you how to make this be a runtime option.  We'd
also be happy to discuss customer demand off-list.

--Sam