Shows cpu usage in seconds, "cpu_id" is ignored.

        :returns: cpu usage in seconds

def get_cpu_usage(self, cpu_id=0):
        """
        Shows cpu usage in seconds, "cpu_id" is ignored.

        :returns: cpu usage in seconds
        """

        cpu_usage = yield from self._hypervisor.send('vm cpu_usage "{name}" {cpu_id}'.format(name=self._name, cpu_id=cpu_id))
        return int(cpu_usage[0])