TASK [insert the public key to the known hosts in hypervisor] ************************************************************************************
fatal: [undercloud-0]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: \"hostvars['hypervisor']\" is undefined\n\nThe error appears to have been in '/home/stack/.infrared/plugins/tripleo-overcloud/hypervisor.yml': line 17, column 9, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n      - name: insert the public key to the known hosts in hypervisor\n        ^ here\n"}

NO MORE HOSTS LEFT *******************************************************************************************************************************
        to retry, use: --limit @/home/stack/.infrared/plugins/tripleo-overcloud/main.retry

PLAY RECAP ***************************************************************************************************************************************hypervisor-0               : ok=1    changed=0    unreachable=0    failed=0
localhost                  : ok=3    changed=0    unreachable=0    failed=0
undercloud-0               : ok=4    changed=1    unreachable=0    failed=1