Automate ovs-appctl command for VTN

The openstack-helm install procedure sets up OvS on each node using this Helm chart:

https://github.com/openstack/openstack-helm/tree/master/openvswitch

To enable VTN to control OvS we can run the following shell command to open up the OvS API on each node for remote access:

PODS=$( kubectl get pod --namespace openstack|grep openvswitch-db|awk '{print $1}' )
for POD in $PODS
do
    kubectl --namespace openstack exec $POD -- ovs-appctl -t ovsdb-server ovsdb-server/add-remote ptcp:6641
done

It would be nice if we could get this result without running any shell commands or changing the openvswitch chart.