[OpenAFS] significant delay for afs user to login as root via su

[Harald Barth]

> I'm not sure I see the value of putting a file that's part of a
> distributed network filesystem in a local directory.

First: The .Xauthority file is only used locally on your machine, why
would you need it in AFS?

Second: If we now can agree that .Xauthority does not need to be in
AFS, why not put it in /tmp and get better security? If /tmp is a
memory file system, the better.

Harald.