Traceback (most recent call last):
  File "/usr/bin/keystone-manage", line 6, in <module>
    from keystone.cmd.manage import main
  File "/usr/lib/python2.7/site-packages/keystone/cmd/manage.py", line 31, in <module>
    from keystone.cmd import cli
  File "/usr/lib/python2.7/site-packages/keystone/cmd/cli.py", line 35, in <module>
    from keystone.federation import idp
  File "/usr/lib/python2.7/site-packages/keystone/federation/idp.py", line 24, in <module>
    from saml2 import client_base
  File "/usr/lib/python2.7/site-packages/saml2/client_base.py", line 10, in <module>
    from saml2.entity import Entity
  File "/usr/lib/python2.7/site-packages/saml2/entity.py", line 7, in <module>
    import requests
  File "/usr/lib/python2.7/site-packages/requests/__init__.py", line 61, in <module>
    from .packages.urllib3.exceptions import DependencyWarning
  File "/usr/lib/python2.7/site-packages/requests/packages/__init__.py", line 29, in <module>
    import urllib3
  File "/usr/lib/python2.7/site-packages/urllib3/__init__.py", line 8, in <module>
    from .connectionpool import (
  File "/usr/lib/python2.7/site-packages/urllib3/connectionpool.py", line 33, in <module>
    from .packages.ssl_match_hostname import CertificateError
  File "/usr/lib/python2.7/site-packages/urllib3/packages/__init__.py", line 3, in <module>
    from . import ssl_match_hostname
ImportError: cannot import name ssl_match_hostname