def delete_access_config(self, parameters, instance_id):
    gce_service, credentials = self.open_connection(parameters)
    http = httplib2.Http()
    auth_http = credentials.authorize(http)
    request = gce_service.instances().deleteAccessConfig(
      project=parameters[self.PARAM_PROJECT],
      accessConfig="External NAT",
      instance=instance_id,
      networkInterface="nic0",
      zone=parameters[self.PARAM_ZONE]
    )
    response = request.execute(http=auth_http)
    AppScaleLogger.verbose(str(response), parameters[self.PARAM_VERBOSE])
Instructs Google Compute Engine to remove the public IP address from
dataset/ETHPy150Open AppScale/appscale-tools/lib/agents/gce_agent.py/GCEAgent.delete_access_config