BIND response policy zones (RPZ) support provides a mechanism for
overriding the responses to DNS queries based on a wide range of
criteria. In the simplest form, a response policy zone can be used to
provide different responses to different clients, or "block" some DNS
names.
For the Pyrocufflink and related networks, I plan to use an RPZ to
implement ad/tracker blocking. The goal will be to generate an RPZ
definition from a collection of host lists (e.g. those used by uBlock
Origin) periodically.
This commit introduces basic support for RPZ configuration in the
*named* role. It can be activated by providing a list of "response
policy" definitions (e.g. `zone "name"`) in the `named_response_policy`
variable, and defining the corresponding zones in `named_zones`.
Dustin
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