VIF drivers for libvirt.
Bases: nova.virt.vif.VIFDriver
VIF driver for Linux bridge.
Ensure that the bridge exists, and add VIF to it.
No manual unplugging required.
Bases: nova.virt.vif.VIFDriver
VIF driver for Open vSwitch.
Unplug the VIF from the network by deleting the port from the bridge.