chore: use alias for nameservers (#283)

- use an alias for nameservers for dhcp ranges
- move aliased nameservers to region-wide hiera

Reviewed-on: https://git.query.consul/unkinben/puppet-prod/pulls/283

hieradata/country/au/region/drw1.yaml

@@ -1,2 +1,9 @@
 ---
 timezone::timezone: 'Australia/Darwin'
+profiles_dns_upstream_forwarder_unkin:
+  - 198.18.17.23
+  - 198.18.17.24
+profiles_dns_upstream_forwarder_consul:
+  - 198.18.17.34
+  - 198.18.17.35
+  - 198.18.17.36

hieradata/country/au/region/drw1/infra/dns/resolver.yaml

@@ -1,8 +1 @@
 ---
-profiles_dns_upstream_forwarder_unkin:
-  - 198.18.17.23
-  - 198.18.17.24
-profiles_dns_upstream_forwarder_consul:
-  - 198.18.17.34
-  - 198.18.17.35
-  - 198.18.17.36

hieradata/country/au/region/syd1.yaml

@@ -1,3 +1,7 @@
 ---
 timezone::timezone: 'Australia/Sydney'
 certbot::client::webserver: ausyd1nxvm1021.main.unkin.net
+profiles_dns_upstream_forwarder_unkin:
+  - 198.18.19.15
+profiles_dns_upstream_forwarder_consul:
+  - 198.18.19.14

hieradata/country/au/region/syd1/infra/dns/resolver.yaml

@@ -1,5 +1 @@
 ---
-profiles_dns_upstream_forwarder_unkin:
-  - 198.18.19.15
-profiles_dns_upstream_forwarder_consul:
-  - 198.18.19.14