This is a reoccurring message, filling up logs with spam. A particularly pathological case is nova-api-wsgi.log:
root@cloudcontrol1006:~# grep -c 'The python binding code in neutronclient is deprecated in favor of OpenstackSDK' /var/log/nova/nova-api-wsgi.log 57904 root@cloudcontrol1006:~# wc -l !$ wc -l /var/log/nova/nova-api-wsgi.log 58055 /var/log/nova/nova-api-wsgi.log