First control plane node is not special anymore

The first control plane node is now identical to any other server
node. The cluster initialization happens once in two steps: first,
make sure that the k3s cluster is initialized and then apply our
configurations while the other nodes join. This change makes the
initialization more resilient and even faster than before.

modules/host/out.tf

@@ -2,6 +2,9 @@ output "ipv4_address" {
   value = hcloud_server.server.ipv4_address
 }
 
+output "private_ipv4_address" {
+  value = var.ip
+}
 
 output "name" {
   value = hcloud_server.server.name