NAS list update without restarting radius server.

[Alan DeKok]

Arran Cudbard-Bell wrote:
>>   If the list update takes longer than 1/10 of a second, something is
>> very wrong.
> 
> Ours often takes ~20 seconds for 600 NAS.

  Ouch.  600 SQL qeuries really take that long?

  i.e. if the SELECT for NASes from SQL takes less than 20s on the
command-line, then something else is doing wrong inside of the server.

  Alan DeKok.