Description of problem:
OSP11 -> OSP12 upgrade: upgrade-non-controller.sh script fails while running the upgrade os-net-config tasks

 upgrade-non-controller.sh --upgrade compute-0 fails with:

TASK [Upgrade os-net-config] ******************************************************************************************************************************************************************************************************************
fatal: [192.168.24.24]: FAILED! => {"failed": true, "msg": "The conditional check 'not os_net_config_need_upgrade.stdout and os_net_config_has_config.rc == 0' failed. The error was: error while evaluating conditional (not os_net_config_need_upgrade.stdout and os_net_config_has_config.rc == 0): 'dict object' has no attribute 'stdout'\n\nThe error appears to have been in '/home/stack/compute-0/tripleo-f7TvgC-config/Compute/upgrade_tasks.yaml': line 148, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n- block:\n  - name: Upgrade os-net-config\n    ^ here\n"}
	to retry, use: --limit @/home/stack/compute-0/tripleo-f7TvgC-config/upgrade_steps_playbook.retry

Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates-7.0.3-12.el7ost.noarch

How reproducible:
100%

Steps to Reproduce:
1. Deploy OSP11
2. Upgrade to OSP12

Actual results:
upgrade-non-controller-sh script fails

Expected results:
upgrade succeeds.

Additional info: