libxl: add "downscript=no" to Qemu call
Currently we only pass script=no to Qemu, to avoid calling any scripts when
attaching a tap interface, but we should also pass downscript=no to avoid Qemu
trying to execute a script when disconnecting the interface. This prevents the
following harmless error message:
/etc/qemu-ifdown: could not launch network script
Signed-off-by: Roger Pau Monne <roger.pau@citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>