Use trash_output in create_admin_via_ssh workflow
When deploying a large amount of nodes, the create_admin_via_ssh
workflow could fail due to the large amount of ansible output generated.
This patch updates the tripleo.ansible-playbook action in the workflow
with trash_output:true so that the output is not saved in the mistral
There is a log file saved already in case the output is needed for debug
(cherry picked from commit