Fix libvirt Connection.get_disks method
Fix libvirt Connection.get_disks method

The get_disks() method is not used anywhere yet, and is not tested properly,
but it does not work as reported in bug #998089.

This patch add unit test for it and fixes it so it's now possible to
retrieve the list of device name associated with a libvirt domain.

Change-Id: If09fb683364174fe02cbcbec4c6bbcda991287d6
Signed-off-by: Julien Danjou <02b9c1d548d177421b793c726ed68b7aac9b5a66@enovance.com>

n0ano/gantt,n0ano/gantt