Return a dict of the last function called for all minions

def get_fun(fun):
    '''
    Return a dict of the last function called for all minions
    '''
    serv = _get_serv(ret=None)
    minions = _get_list(serv, 'minions')
    returns = serv.get_multi(minions, key_prefix='{0}:'.format(fun))
    # returns = {minion: return, minion: return, ...}
    ret = {}
    for minion, data in six.iteritems(returns):
        ret[minion] = salt.utils.json.loads(data)
    return ret