/usr/share/tripleo-heat-templates/all-nodes-validation.yaml is in python-tripleo-heat-templates 5.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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description: >
  Software Config to drive validations that occur on all nodes.
  Note, you need the heat-config-script element built into your
  images, due to the script group below.
parameters:
  PingTestIps:
    default: ''
    description: A string containing a space separated list of IP addresses used to ping test each available network interface.
    type: string
resources:
  AllNodesValidationsImpl:
    type: OS::Heat::SoftwareConfig
    properties:
      group: script
      inputs:
        - name: ping_test_ips
          default: {get_param: PingTestIps}
      config: {get_file: ./validation-scripts/all-nodes.sh}
outputs:
  OS::stack_id:
    description: The ID of the AllNodesValidationsImpl resource.
    value: {get_resource: AllNodesValidationsImpl}
 |