feat: consul multi-datacentre joining

- add method to join multiple consul datacentres
- set syd1 as the primary datacentre
- use default token from au-syd1 cluster in all locations
- add replication token

hieradata/country/au/region/drw1/infra/storage/consul.yaml

@@ -1,4 +1,7 @@
 ---
 profiles::consul::server::bootstrap_count: 3
 profiles::consul::server::raft_multiplier: 10
-profiles::consul::server::primary_datacenter: 'au-drw1'
+profiles::consul::server::primary_datacenter: 'au-syd1'
+profiles::consul::server::join_remote_regions: true
+profiles::consul::server::remote_regions:
+  - syd1