Add powershell script for retreiving disk info for a hyper-v guest

plugins/providers/hyperv/scripts/list_hdds.ps1

@@ -0,0 +1,14 @@
+#Requires -Modules VagrantMessages
+
+param(
+    [Parameter(Mandatory=$true)]
+    [string]$VmId
+)
+
+try {
+    $VM = Hyper-V\Get-VM -Id $VmId
+    Hyper-V\Get-VMHardDiskDrive -VMName $VM
+} catch {
+    Write-ErrorMessage "Failed to retrieve all disk info from ${VM}: ${PSItem}"
+    exit 1
+}