Description of problem:
Processing of upgrade OVN-osp13 to osp14 failed on overcloud_upgrade_run_Compute
step in task "Set fact networking_ovn_metadata_agent_enabled"



2018-12-23 07:57:40 |  u'',
2018-12-23 07:57:40 |  u'TASK [Set fact networking_ovn_metadata_agent_enabled] **************************',
2018-12-23 07:57:40 |  u'Sunday 23 December 2018  07:57:38 -0500 (0:00:00.392)       0:01:08.108 ******* ',
2018-12-23 07:57:40 |  u'fatal: [compute-1]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: \'networking_ovn_metadata_agent_enabled\' is undefined\\n\\nThe error appears to have been in \'/var/lib/mistral/ac14c5f3-92da-450e-b216-8cebb4399cda/Compute/upgrade_tasks.yaml\': line 112, column 5, but may\\nbe elsewhere in the file depending on the exact syntax problem.\\n\\nThe offending line appears to be:\\n\\n    register: networking_ovn_metadata_agent_enabled_result\\n  - name: Set fact networking_ovn_metadata_agent_enabled\\n    ^ here\\n"}',
2018-12-23 07:57:40 |  u'fatal: [compute-0]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: \'networking_ovn_metadata_agent_enabled\' is undefined\\n\\nThe error appears to have been in \'/var/lib/mistral/ac14c5f3-92da-450e-b216-8cebb4399cda/Compute/upgrade_tasks.yaml\': line 112, column 5, but may\\nbe elsewhere in the file depending on the exact syntax problem.\\n\\nThe offending line appears to be:\\n\\n    register: networking_ovn_metadata_agent_enabled_result\\n  - name: Set fact networking_ovn_metadata_agent_enabled\\n    ^ here\\n"}',
2018-12-23 07:57:40 |  u'',
2018-12-23 07:57:40 |  u'PLAY RECAP *********************************************************************',
2018-12-23 07:57:40 |  u'compute-0                  : ok=23   changed=8    unreachable=0    failed=1   ',
2018-12-23 07:57:40 |  u'compute-1                  : ok=23   changed=8    unreachable=0    failed=1   ',
2018-12-23 07:57:40 |  u'',
2018-12-23 07:57:40 |  u'Sunday 23 December 2018  07:57:38 -0500 (0:00:00.088)       0:01:08.197 ******* ',
2018-12-23 07:57:40 |  u'=============================================================================== ']
2018-12-23 07:57:40 | [u'Failed to update nodes - Compute, please see the logs.']
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Version-Release number of selected component (if applicable):

from osp13 z3 to osp14 2018-12-20.4
How reproducible:

100% 
Steps to Reproduce:
1.run upgrade job.
2.
3.

Actual results:


Expected results:


Additional info:
https://rhos-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/DFG/view/network/view/networking-ovn/job/DFG-network-networking-ovn-upgrade-13-14_director-rhel-virthost-3cont_2comp_2net-ipv4-geneve-composable/58/