bind: parametrize additional named.conf options
The only change here is the increase to 10k recursive clients from the default 1k (https://bind9.readthedocs.io/en/v9_18_5/reference.html#namedconf-statement-recursive-clients)
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The only change here is the increase to 10k recursive clients from the default 1k (https://bind9.readthedocs.io/en/v9_18_5/reference.html#namedconf-statement-recursive-clients)