Reset performance statistics to zero across the cluster.

    .. code-block:: yaml

        zero_ats_cluster:
          trafficserver.zero_cluster

def zero_cluster(name):
    '''
    Reset performance statistics to zero across the cluster.

    .. code-block:: yaml

        zero_ats_cluster:
          trafficserver.zero_cluster
    '''
    ret = {'name': name,
           'changes': {},
           'result': None,
           'comment': ''}

    if __opts__['test']:
        ret['comment'] = 'Zeroing cluster statistics'
        return ret

    __salt__['trafficserver.zero_cluster']()

    ret['result'] = True
    ret['comment'] = 'Zeroed cluster statistics'
    return ret