Add response-policy to the dns::view #251

Could you please add response-policy to the dns::view defined type, so it can be called from view.pp or else, simillar option like additional_directives and additional_options.

As an example

view "example" {
  match-clients { 192.168.0.0/24; };
  response-policy {
    zone "rpz";
  };
  zone "rpz" {
    type master;
    file "/var/cache/bind/zones/db.rpz";
  };
};

Thank you.