Cinder API not starting after OSP10 upgrade

Issue

• While upgrading from OSP9 to OSP10, the openstack-cinder-api service is not starting on all 3 controllers.
• Error in the /var/log/cinder/api.log:

2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
2017-10-21 19:05:42.151 40222 ERROR cinder     return context.create()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2017-10-21 19:05:42.151 40222 ERROR cinder     return self.object_type.invoke(self)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2017-10-21 19:05:42.151 40222 ERROR cinder     **context.local_conf)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 55, in fix_call
2017-10-21 19:05:42.151 40222 ERROR cinder     val = callable(*args, **kw)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/__init__.py", line 34, in root_app_factory
2017-10-21 19:05:42.151 40222 ERROR cinder     return paste.urlmap.urlmap_factory(loader, global_conf, **local_conf)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/urlmap.py", line 25, in urlmap_factory
2017-10-21 19:05:42.151 40222 ERROR cinder     app = loader.get_app(app_name, global_conf=global_conf)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 350, in get_app
2017-10-21 19:05:42.151 40222 ERROR cinder     name=name, global_conf=global_conf).create()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2017-10-21 19:05:42.151 40222 ERROR cinder     return self.object_type.invoke(self)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2017-10-21 19:05:42.151 40222 ERROR cinder     **context.local_conf)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 55, in fix_call
2017-10-21 19:05:42.151 40222 ERROR cinder     val = callable(*args, **kw)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/middleware/auth.py", line 56, in pipeline_factory
2017-10-21 19:05:42.151 40222 ERROR cinder     app = loader.get_app(pipeline[-1])
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 350, in get_app
2017-10-21 19:05:42.151 40222 ERROR cinder     name=name, global_conf=global_conf).create()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2017-10-21 19:05:42.151 40222 ERROR cinder     return self.object_type.invoke(self)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 146, in invoke
2017-10-21 19:05:42.151 40222 ERROR cinder     return fix_call(context.object, context.global_conf, **context.local_conf)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 55, in fix_call
2017-10-21 19:05:42.151 40222 ERROR cinder     val = callable(*args, **kw)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/openstack/__init__.py", line 72, in factory
2017-10-21 19:05:42.151 40222 ERROR cinder     return cls()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/openstack/__init__.py", line 84, in __init__
2017-10-21 19:05:42.151 40222 ERROR cinder     self._setup_ext_routes(mapper, ext_mgr)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/openstack/__init__.py", line 89, in _setup_ext_routes
2017-10-21 19:05:42.151 40222 ERROR cinder     for resource in ext_mgr.get_resources():
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/extensions.py", line 156, in get_resources
2017-10-21 19:05:42.151 40222 ERROR cinder     resources.extend(ext.get_resources())
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/contrib/backups.py", line 261, in get_resources
2017-10-21 19:05:42.151 40222 ERROR cinder     Backups.alias, BackupsController(),
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/api/contrib/backups.py", line 42, in __init__
2017-10-21 19:05:42.151 40222 ERROR cinder     self.backup_api = backupAPI.API()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/backup/api.py", line 72, in __init__
2017-10-21 19:05:42.151 40222 ERROR cinder     self.backup_rpcapi = backup_rpcapi.BackupAPI()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/rpc.py", line 194, in __init__
2017-10-21 19:05:42.151 40222 ERROR cinder     obj_version_cap = self.determine_obj_version_cap()
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/rpc.py", line 233, in determine_obj_version_cap
2017-10-21 19:05:42.151 40222 ERROR cinder     cinder.context.get_admin_context(), cls.BINARY)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/objects/service.py", line 188, in get_minimum_obj_version
2017-10-21 19:05:42.151 40222 ERROR cinder     binary)
2017-10-21 19:05:42.151 40222 ERROR cinder   File "/usr/lib/python2.7/site-packages/cinder/objects/service.py", line 173, in _get_minimum_version
2017-10-21 19:05:42.151 40222 ERROR cinder     raise exception.ServiceTooOld(msg)
2017-10-21 19:05:42.151 40222 ERROR cinder ServiceTooOld: One of the services is in Liberty version. We do not provide backward compatibility with Liberty now, you need to upgrade to Mitaka first.
2017-10-21 19:05:42.151 40222 ERROR cinder