lxd/instance/drivers/driver/qemu: Removes device name used as nic name in addNetDevConfig
lxd/instance/drivers/driver/qemu: Removes device name used as nic name in addNetDevConfig

We can't use device name as nic name as it can contain incompatible characters.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

stgraber/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,lxc/lxd