Add availability_set_id to VM module

[stiross79]

Module Name

vm

Description

Add availability_set_id to the VM module

Example Terraform Configuration

variable "availability_set_id" {
  description = "Specifies the ID of the Availability Set in which the Virtual Machine should exist."
  type        = string
  default     = null
}

...
availability_set_id = var.availability_set_id
...