it seems you want something like:

- name: generate ssh key
  ...
  when: clusterdata.stdout_lines

- name: install generated key
   ...
   when: not clusterdata.stdout_lines


or you can check the length of clusterdata.stdout_lines, which seems
to be only populated on the admin node. I would still add it to your
inventory as it is easier to segregate by groups or a group/host var.

-- 
Brian Coca

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