[Users] New OpenSER Config Generator features

[Andreas Granig]

Bogdan-Andrei Iancu wrote:
>> The value is loaded by the usr-preferences feature. The ring-timeout 
>> feauture then uses the AVP.
>>
> should be better to use "load_credentials" to get rid of an extra db query?

But ring-timeout is a callee-feature, and I've no idea how to load 
uuid-based callee AVPs with less then two queries (first select the 
uuid, then call avp_db_load). Caller UUID is fetched using 
load_credentials, though.

Cheers,
Andreas

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