xen: switch Netif over to Activations.after rather than Activations.wait
xen: switch Netif over to Activations.after rather than Activations.wait

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

mato/mirage-solo5,mato/mirage-solo5