def plug_vifs(self, instance, network_info):
    'Plug VIFs into networks.'
    for vif in network_info:
        self.vif_driver.plug(instance, vif)
Plug VIFs into networks.
def plug_vifs(self, instance, network_info):
    
    for vif in network_info:
        self.vif_driver.plug(instance, vif)