Land rapid7#5044, missing HKLM in regkey

Author: egypt

modules/post/windows/gather/checkvm.rb

@@ -251,7 +251,7 @@ def xenchk(session)
       end
     end
     if not vm
-      srvvals = registry_enumkeys('HARDWARE\ACPI\FADT')
+      srvvals = registry_enumkeys('HKLM\HARDWARE\ACPI\FADT')
       if srvvals and srvvals.include?("Xen")
         vm = true
       end