[OpenAFS] Running vos or pts against a specific cell server

[Harald Barth]

> Sadly, AFSCONF is only used if a configuration file cannot be found in the default location.

That I would say is either a bug in the implementation or in the design. When someone sets an
environment variable, the meaning is to 99% to use the value in it.

> I wrote the support for -config to work around this, but that
> feature is, as Andrew says, only available on master.

I would suggest that the priority should be changed in the following way:

1. Command line if given
2. Env variable if set
3. Default place as compiled in

Harald.