[root@ceph2 ~]# openstack-config --set /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini ovs bridge_mappings extnet:br-ex
[Errno 2] No such file or directory: '/etc/neutron/plugins/openvswitch/.ovs_neutron_plugin.ini.crudini.lck'
[root@ceph2 ~]# ll /etc/neutron/plugins/
total 4
drwxr-xr-x. 2 root root 4096 Jan  5 21:49 ml2