jenkins: chronos test ValueError

[pinggao187]

____________________ TestDoppelganer.test_init_doppelganer _____________________

self = <test.zoo.chronos.simulator.test_doppelganger_simulator.TestDoppelganer testMethod=test_init_doppelganer>

    def test_init_doppelganer(self):
>       df = get_train_data()

../test/zoo/chronos/simulator/test_doppelganger_simulator.py:86: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../test/zoo/chronos/simulator/test_doppelganger_simulator.py:60: in get_train_data
    with req.urlopen(dfp) as dp:
/Users/arda/anaconda3/envs/py36/lib/python3.6/urllib/request.py:223: in urlopen
    return opener.open(url, data, timeout)
/Users/arda/anaconda3/envs/py36/lib/python3.6/urllib/request.py:511: in open
    req = Request(fullurl, data)
/Users/arda/anaconda3/envs/py36/lib/python3.6/urllib/request.py:329: in __init__
    self.full_url = url
/Users/arda/anaconda3/envs/py36/lib/python3.6/urllib/request.py:355: in full_url
    self._parse()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <urllib.request.Request object at 0x7fe50ea90208>

    def _parse(self):
        self.type, rest = splittype(self._full_url)
        if self.type is None:
>           raise ValueError("unknown url type: %r" % self.full_url)
E           ValueError: unknown url type: 'None/analytics-zoo-data/apps/doppelGANger_data/data_train_small.npz'

/Users/arda/anaconda3/envs/py36/lib/python3.6/urllib/request.py:384: ValueError

jenkins link: http://10.112.231.51:18888/job/ZOO-NB-UnitTests-2.4-PYTHON-MAC/513/console pr: Chronos: add ut for doppelganger_simulator intel-analytics/analytics-zoo#4850 @liangs6212 pls have a look.