unbound: Add secondry DHCP server and fix interface binding

Unbound can't bind to CARP interfaces without explicit definition.

roles/unbound/files/unbound.conf.dna-gw02.home.foo.sh

@@ -0,0 +1,28 @@
+
+server:
+    interface: 127.0.0.1
+    interface: ::1
+    interface: 172.20.20.10
+    interface: 172.20.21.2
+
+
+    access-control: 127.0.0.0/8 allow
+    access-control: ::1 allow
+    access-control: 172.20.20.0/22 allow
+
+    hide-identity: yes
+    hide-version: yes
+
+    prefetch: yes
+    unblock-lan-zones: yes
+
+remote-control:
+    control-enable: yes
+    control-interface: /var/run/unbound.sock
+
+auth-zone:
+    name: "home.foo.sh"
+    zonefile: "/var/unbound/db/home.foo.sh"
+auth-zone:
+    name: "20.172.in-addr.arpa"
+    zonefile: "/var/unbound/db/20.172.in-addr.arpa"

roles/unbound/files/unbound.conf.gw01.home.foo.sh

@@ -2,8 +2,9 @@
 server:
     interface: 127.0.0.1
     interface: ::1
-    interface: 0.0.0.0
-    interface: ::0
+    interface: 172.20.20.10
+    interface: 172.20.21.1
+
 
     access-control: 127.0.0.0/8 allow
     access-control: ::1 allow