Open Stack

I have deployed OSA and all good but having small issue in following file.

# cat /etc/neutron/plugins/ml2/linuxbridge_agent.ini

[linux_bridge]
physical_interface_mappings = flat:eth12,vlan:br-vlan

I WANT TO CHANGE IT TO FOLLWOING

physical_interface_mappings = vlan:br-vlan


I have overwrite variable in following file like this.

# cat /etc/openstack_deploy/user_variables.yml

neutron_linuxbridge_agent_ini_overrides:
  linux_bridge:
    physical_interface_mappings = vlan:br-vlan


after re-run playbook it updated file with following format, am i
missing something here?

[DEFAULT]
linux_bridge = physical_interface_mappings = vlan:br-vlan

[linux_bridge]
physical_interface_mappings = flat:eth12,vlan:br-vlan