Remove list_disks/list_interfaces from virt driver
Remove list_disks/list_interfaces from virt driver

Removes the list_disks and list_interfaces functions from the
Nova virt driver. These functions are not used.

Fixes LP Bug #1007005.

Change-Id: I69296866f2cae712fbf7f0b8cb50c282714f04b8

n0ano/gantt,n0ano/gantt