'Get the InstanceList for the specified host, and store it in the
_instance_info dict.'

def _recreate_instance_info(self, context, host_name):

    inst_dict = self._get_instances_by_host(context, host_name)
    host_info = self._instance_info[host_name] = {}
    host_info['instances'] = inst_dict
    host_info['updated'] = False
