Add radius server hostname to tickets

[Arran Cudbard-Bell]

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A.L.M.Buxey at lboro.ac.uk wrote:
> Hi,
>
>>   Ok... this is something which should be addressed.  The simplest thing
>> maybe to update the configuration parser to allow it to environment
>> variables, e.g. $HOSTNAME, or something similar.
>
> that'd be perfect.  +1 vote from me for that one.
Second that. Would mean I could get rid of the branches in subversion
and the raddb.local files.

Arran
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