Update method retrieving mounted disks to work with DVD drives
Update method retrieving mounted disks to work with DVD drives

This patch updates the query used by the vmutils
_get_mounted_disk_resource_from_path method so that it can also
retrieve disks attached as DVD drives.

This change is needed by the Nova rescue blueprint implementation.

Change-Id: I3e1ea18128b882c832309875db6de1d112efd67f

openstack/os-win