exception due to missing include when using configurtaion option log_config

gkotton@gkotton-ubuntu12:/opt/stack/quantum$ cd /opt/stack/quantum && sudo python /opt/stack/quantum/bin/quantum-server --config-file /etc/quantum/quantum.conf --config-file /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini
ERROR:root:in WsgiService.create()
Traceback (most recent call last):
  File "/opt/stack/quantum/quantum/service.py", line 78, in serve_wsgi
    service = cls.create()
  File "/opt/stack/quantum/quantum/service.py", line 61, in create
    config.setup_logging(cfg.CONF)
  File "/opt/stack/quantum/quantum/common/config.py", line 82, in setup_logging
    logging.config.fileConfig(conf.log_config)
AttributeError: 'module' object has no attribute 'config'
Traceback (most recent call last):
  File "/opt/stack/quantum/bin/quantum-server", line 26, in <module>
    server()
  File "/opt/stack/quantum/quantum/server/__init__.py", line 40, in main
    quantum_service = service.serve_wsgi(service.QuantumApiService)
  File "/opt/stack/quantum/quantum/service.py", line 78, in serve_wsgi
    service = cls.create()
  File "/opt/stack/quantum/quantum/service.py", line 61, in create
    config.setup_logging(cfg.CONF)
  File "/opt/stack/quantum/quantum/common/config.py", line 82, in setup_logging
    logging.config.fileConfig(conf.log_config)
AttributeError: 'module' object has no attribute 'config'
gkotton@gkotton-ubuntu12:/opt/stack/quantum$