201-vmss-disk-encryption-extension patch (#153)

* fix 201-vmss-disk-encryption-extension example

quickstart/201-vmss-disk-encryption-extension/variables.tf

@@ -1,15 +1,17 @@
-variable "admin_password" {
-  type        = string
-  sensitive   = true
-  description = "Admin password of the virtual machine scale set"
-}
-
 variable "location" {
   type        = string
+  default     = "eastus"
   description = "Location where resources will be created"
 }
 
-variable "name_prefix" {
+variable "msi_id" {
   type        = string
-  description = "Prefix of the resource name"
+  default     = null
+  description = "If you're executing the test with user assigned identity, please pass the identity principal id to this variable."
 }
+
+variable "prefix" {
+  type        = string
+  default     = "vmss-disk-e-e"
+  description = "Prefix of the resource name"
+}