Remove Azure admin_password (disabled) now that its optional

* Requires terraform-provider-azurerm v1.16.0 or higher
https://github.com/terraform-providers/terraform-provider-azurerm/pull/1958

azure/container-linux/kubernetes/require.tf

@@ -0,0 +1,26 @@
+# Terraform version and plugin versions
+
+terraform {
+  required_version = ">= 0.11.0"
+}
+
+provider "azurerm" {
+  version = "~> 1.16"
+}
+
+provider "local" {
+  version = "~> 1.0"
+}
+
+provider "null" {
+  version = "~> 1.0"
+}
+
+provider "template" {
+  version = "~> 1.0"
+}
+
+provider "tls" {
+  version = "~> 1.0"
+}
+

azure/container-linux/kubernetes/workers/workers.tf

@@ -37,10 +37,7 @@ resource "azurerm_virtual_machine_scale_set" "workers" {
   os_profile {
     computer_name_prefix = "${var.name}-worker-"
     admin_username       = "core"
-
-    # Required by Azure, but password auth is disabled below
-    admin_password = ""
-    custom_data    = "${element(data.ct_config.worker-ignitions.*.rendered, count.index)}"
+    custom_data          = "${element(data.ct_config.worker-ignitions.*.rendered, count.index)}"
   }
 
   # Azure mandates setting an ssh_key, even though Ignition custom_data handles it too