setup-storage: set vgname to hostname

[Jean Spirat]

> I prefer using my own variables in my own namespace and initialize them
> from a "known good" source - like $HOSTNAME. This may not be the most
> obvious solution, but this way you can guarantee that "your" variable has
> a valid value. And if $HOSTNAME turns out to be unrealiable - or undesired
> - then you could easily change the source (like maybe retrieving the value
> from an external database.) without having to wade through the rest of the
> source code trying hard not to introduce new bugs.
>
> tschüß
> thomas
>   
ok so any defined variables can be used in setup storage (like in 
http://www.informatik.uni-koeln.de/fai/fai-guide/ch-config.html#s-classvariables).

 I had not thinked of this before i was seeing this as a static file. 
good to know thanks :)

regards,
JEan