Overcloud deployment fail due to missing `host_mac` parameter in fencing.yaml

Issue

• Deployment failed on all controllers with the following errors in ansible log

  Mar 12 00:46:10 puppet-user: Error: Evaluation Error: Error while evaluating a Function Call, local_fence_devices: Only single fence device per agent per host is allowed. C
  ollision on  for fence_ipmilan (file: /etc/puppet/modules/tripleo/manifests/fencing.pp, line: 131, column: 24) on node controller-1.localdomain"], "stdout": "", "stdout_lines": []}
  
  Mar 12 00:46:10 puppet-user: Error: Evaluation Error: Error while evaluating a Function Call, local_fence_devices: Only single fence device per agent per host is allowed. Collision on  for fence_ipmilan (file: /etc/puppet/modules/tripleo/manifests/fencing.pp, line: 131, column: 24) on node controller-2.localdomain"], "stdout": "", "stdout_lines": []}
  
  Mar 12 00:46:10 puppet-user: Error: Evaluation Error: Error while evaluating a Function Call, local_fence_devices: Only single fence device per agent per host is allowed. Collision on  for fence_ipmilan (file: /etc/puppet/modules/tripleo/manifests/fencing.pp, line: 131, column: 24) on node controller-3.localdomain"], "stdout": "", "stdout_lines": []}