type object got multiple values for keyword argument 'auth'

use ceilometerclient.get_client，and set 'auth' in kwargs.raise TypeError: type object got multiple values for keyword argument 'auth'.

Traceback (most recent call last):
  File "test.py", line 26, in <module>
    cclient = ceilometer_client.get_client('2', **args)
  File "/usr/lib/python2.7/site-packages/ceilometerclient/client.py", line 366, in get_client
    return Client(version, endpoint, **kwargs)
  File "/usr/lib/python2.7/site-packages/ceilometerclient/client.py", line 313, in Client
    return client_class(*args, **client_kwargs)
  File "/usr/lib/python2.7/site-packages/ceilometerclient/v2/client.py", line 64, in __init__
    self.http_client = ceiloclient._construct_http_client(**kwargs)
  File "/usr/lib/python2.7/site-packages/ceilometerclient/client.py", line 417, in _construct_http_client
    **kwargs)
TypeError: type object got multiple values for keyword argument 'auth'