Comment 5 for bug 1793347

There are the same question in centos7.4 when use kolla-ansible to deploy openstack rocky

TASK [keystone: Initialise fernet key authentication]**********************
FAILED -(10 retries left)

Traceback (most recent call last):
  File "/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 19, in <module>
    from keystone.cmd import cli
  File "/usr/lib/python2.7/site-packages/keystone/cmd/cli.py", line 29, in <module>
    from keystone.cmd import bootstrap
  File "/usr/lib/python2.7/site-packages/keystone/cmd/bootstrap.py", line 17, in <module>
    from keystone.common import driver_hints
  File "/usr/lib/python2.7/site-packages/keystone/common/driver_hints.py", line 18, in <module>
    from keystone import exception
  File "/usr/lib/python2.7/site-packages/keystone/exception.py", line 20, in <module>
    import keystone.conf
  File "/usr/lib/python2.7/site-packages/keystone/conf/__init__.py", line 27, in <module>
    from keystone.conf import default
  File "/usr/lib/python2.7/site-packages/keystone/conf/default.py", line 60, in <module>
    deprecated_since=versionutils.deprecated.ROCKY,
AttributeError: type object 'deprecated' has no attribute 'ROCKY'