Overcloud redeployment failed with "Unable to switch from ovn to openvswitch neutron mechanism drivers on upgrade" message

Issue

• Overcloud redeployment with OVS failed with Unable to switch from ovn to openvswitch neutron mechanism drivers on upgrade message.

  (undercloud) $ openstack overcloud deploy --templates \
      :
  > -e ${TEMPLATES}/environments/services/neutron-ovs.yaml \
  > -e ${TEMPLATES}/environments/services/neutron-ovs-dpdk.yaml \
  > -e ${TEMPLATES}/environments/services/neutron-sriov.yaml \
      :
  Removing the current plan files
  Uploading new plan files
  Temporary Swift GET/PUT URL parameters have successfully been updated.
  Plan updated.
  Processing templates in the directory /tmp/tripleoclient-naykykk5/tripleo-heat-templates
  Unable to switch from ovn to openvswitch neutron mechanism drivers on upgrade. Please consult the documentation.