nova-manage db_sync
Traceback (most recent call last):
  File "/usr/local/bin/nova-manage", line 6, in <module>
    from nova.cmd.manage import main
  File "/usr/local/lib/python2.7/dist-packages/nova/cmd/manage.py", line 70, in <module>
    from nova.api.ec2 import ec2utils
  File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/__init__.py", line 36, in <module>
    from nova.api.ec2 import apirequest
  File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/apirequest.py", line 30, in <module>
    from nova.api.ec2 import ec2utils
  File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/ec2utils.py", line 31, in <module>
    from nova.objects import base as obj_base
  File "/usr/local/lib/python2.7/dist-packages/nova/objects/base.py", line 28, in <module>
    from oslo_versionedobjects import base as ovoo_base
ImportError: No module named oslo_versionedobjects