源码安装keystone，生成pki证书出错

[root@openstack1 keystone-2014.1]# keystone-manage pki_setup --keystone-user root --keystone-group root
Traceback (most recent call last):
  File "/usr/bin/keystone-manage", line 37, in
    from keystone import cli
  File "/usr/lib/python2.7/site-packages/keystone/cli.py", line 19, in
    from oslo.config import cfg
ImportError: No module named config
[root@openstack1 keystone-2014.1]# pip freeze |grep config
config==0.3.9
configobj==4.7.2
oslo.config==2.2.0