Add support for allow-recursion

[scibi]

It would be nice to be able to specify list of allow-recursion parameters.

[resmo]

Actually you already can!

bind_config_recursion: "yes"

[scibi]

bind_config_recursion only sets recursion to yes or no. What I was asking for is an ability to set allow-recursion to an address match list.

It is important because bind allows recursive queries only from localnet/localhost by default.

[resmo]

@scibi ah! I see. Yeah why not!