[Libguestfs] Order of list-devices changes when libguestfs uses virtio

[Matthew Booth]

Output from guestfish after upgrading to rawhide libguestfs, compiled
with virtio:

><fs> add_drive "/dev/Guests/RHEL52PV32"
><fs> add_cdrom "/var/lib/virt-v2v/transfer.iso"
><fs> launch
><fs> list-devices
/dev/sr0
/dev/vda

Note that the order has swapped. If these aren't consistent we don't
have a good way to determine which host devices map to which guest devices.

Matt
-- 
Matthew Booth, RHCA, RHCSS
Red Hat Engineering, Virtualisation Team

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