Default ACLs for FILE: ccaches on Windows

[Jeffrey Altman]

Ken Raeburn wrote:
> How about a support function for "create a file only I have access to",
> and use that for file-based ccaches and keytabs, and maybe replay
> caches?  Put the file-mode and ACL junk in there.  (Since at the moment
> we're only talking about libkrb5 functionality, I'd keep it in there.)
> 
> Ken

I think that would be fine.   This function should be used not only
for ccaches but also for keytabs and perhaps replay caches.