netlink/netlink_linux.go
func DelFromBridge(iface, master *net.Interface) error {
	return ifIoctBridge(iface, master, SIOC_BRDELIF)
}
func DelFromBridge(iface, master *net.Interface) error {
	return ifIoctBridge(iface, master, SIOC_BRDELIF)
}
// Detach a slave from a bridge device.  This is more backward-compatible than
// netlink.NetworkSetMaster and works on RHEL 6.