unlang code to unroll a list attribute

[Jonathan Davis]

regex could match it, tho there might be a less complicated way to split a string in the docs

> On Feb 14, 2023, at 8:58 AM, Hermann.Lauer at uni-heidelberg.de wrote:
> 
> Hello All,
> 
> how in unlang can a list attribute be converted into a string of the values,
> eg. the DHCP-Parameter-Request-List into something like:
> "DHCP-Subnet-Mask,DHCP-Router-Address,DHCP-Domain-Name-Server" ?
> 
> Thanks and greetings
>  Hermann
> -
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