dns variables : move to canonical locations

We have three groups

 adns : the hidden primary bind server
 ns : the secondary public authoratitive servers
 dns : both of the above

Only the primary server needs to clone the bind config repos and
notify the secondary servers on updates.  So the dns_repos and
dns_notify arguments can go into adns.yaml so they're only available
to the primary server.

Only the secondary servers need to know the ip address of the
master/primary server so it can allow itself to be notified by that
IP, and do transfer requests.  So dns_master_ipv<4|6> can live in
ns.yaml

This leaves in dns.yaml the one thing both have to agree on, which is
the zones to transfer betwen each other.

Change-Id: Ibd8063e92ad7ff9ee683dcc7dfcc115a0b19dcaa

inventory/service/group_vars/adns.yaml

@@ -1,3 +1,13 @@
+dns_repos:
+  - name: zone-opendev.org
+    url: https://opendev.org/opendev/zone-opendev.org
+  - name: zone-zuul-ci.org
+    url: https://opendev.org/opendev/zone-zuul-ci.org
+  - name: zone-gating.dev
+    url: https://opendev.org/opendev/zone-gating.dev
+dns_notify:
+  - 104.239.140.165
+  - 162.253.55.16
 iptables_extra_allowed_hosts:
   - protocol: tcp
     port: 53

inventory/service/group_vars/dns.yaml

@@ -1,10 +1,3 @@
-dns_repos:
-  - name: zone-opendev.org
-    url: https://opendev.org/opendev/zone-opendev.org
-  - name: zone-zuul-ci.org
-    url: https://opendev.org/opendev/zone-zuul-ci.org
-  - name: zone-gating.dev
-    url: https://opendev.org/opendev/zone-gating.dev
 dns_zones:
   - name: gating.dev
     source: zone-gating.dev/zones/gating.dev/
@@ -17,8 +10,3 @@ dns_zones:
     source: zone-zuul-ci.org/zones/zuul-ci.org/
   - name: zuulci.org
     source: zone-zuul-ci.org/zones/zuulci.org/
-dns_notify:
-  - 104.239.140.165
-  - 162.253.55.16
-dns_master_ipv4: 104.239.146.24
-dns_master_ipv6: 2001:4800:7819:104:be76:4eff:fe04:43d0

inventory/service/group_vars/ns.yaml

@@ -1,3 +1,6 @@
+dns_master_ipv4: 104.239.146.24
+dns_master_ipv6: 2001:4800:7819:104:be76:4eff:fe04:43d0
+
 iptables_extra_public_tcp_ports:
   - 53
 iptables_extra_public_udp_ports: