CA-184556: remove unnecessary vbd_unplug_order function
CA-184556: remove unnecessary vbd_unplug_order function

Signed-off-by: Marcus Granado <376d5baee5c4fa16573fd56e7ac3b2e27505de87@citrix.com>

johnelse/xenopsd,euanh/xenopsd,johnelse/xenopsd,euanh/xenopsd,euanh/xenopsd,thomassa/xenopsd,thomassa/xenopsd,johnelse/xenopsd,thomassa/xenopsd