User story66570 (#184)

* Changes to VM image; Added type attr to all vars

quickstart/101-vm-with-infrastructure/variables.tf

@@ -1,9 +1,11 @@
 variable "resource_group_location" {
+  type        = string
   default     = "eastus"
   description = "Location of the resource group."
 }
 
 variable "resource_group_name_prefix" {
+  type        = string
   default     = "rg"
   description = "Prefix of the resource group name that's combined with a random ID so name is unique in your Azure subscription."
 }