>>> from novaclient import client
>>> conn = client.HTTPClient("xxx", "xxx", "customer1", "http://xx.xx.xx.xx:5000/v2.0")
>>> from novaclient import keystone
>>> kc = keystone.Client(conn)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/python_novaclient-2.6.6-py2.7.egg/novaclient/keystone/client.py", line 49,
in __init__
    endpoint = client.service_catalog.url_for('identity', 'admin')
  File "/usr/lib/python2.7/site-packages/python_novaclient-2.6.6-py2.7.egg/novaclient/service_catalog.py", line 43,
in url_for
    if filter_value == None or endpoint[attr] == filter_value:
KeyError: 'identity'