def del_lease(mac, ip_address):
    api = network_rpcapi.NetworkAPI()
    api.release_fixed_ip(context.get_admin_context(), ip_address,
                         CONF.host, mac)
Called when a lease expires.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/cmd/dhcpbridge.py/del_lease