feat: add vrrp to halb

- update keepalived module to 5.1.0
- add keepalived::vrrp::* to be deep merged in hiera
- add vrrp dns configuration
- add vrrp instance/script to halb in syd1

hieradata/nodes/ausyd1nxvm1015.main.unkin.net.yaml

@@ -5,3 +5,9 @@ networking::interfaces:
 networking::routes:
   default:
     gateway: 198.18.13.254
+
+profiles::haproxy::dns::vrrp_master: true
+keepalived::vrrp_instance:
+  VI_250:
+    state: 'MASTER'
+    priority: 101

hieradata/nodes/ausyd1nxvm1016.main.unkin.net.yaml

@@ -5,3 +5,8 @@ networking::interfaces:
 networking::routes:
   default:
     gateway: 198.18.13.254
+
+keepalived::vrrp_instance:
+  VI_250:
+    state: 'BACKUP'
+    priority: 100