Description of problem:
OSP11 -> OSP12 upgrade: compute upgrade fails during Stop and disable ceilometer compute agent: dict object' has no attribute 'rc':

TASK [Stop and disable ceilometer compute agent] *******************************
fatal: [192.168.24.13]: FAILED! => {"failed": true, "msg": "The conditional check '(openstack_ceilometer_compute_enabled.rc == 0) and (step|int == 2)' failed. The error was: error while evaluating conditional ((openstack_ceilometer_compute_enabled.rc == 0) and (step|int == 2)): 'dict object' has no attribute 'rc'\n\nThe error appears to have been in '/home/stack/compute-0/tripleo-_hahkO-config/Compute/upgrade_tasks.yaml': line 45, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  when: step|int == 2\n- name: Stop and disable ceilometer compute agent\n  ^ here\n"}
        to retry, use: --limit @/home/stack/compute-0/tripleo-_hahkO-config/upgrade_steps_playbook.retry


Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates-7.0.0-0.20170901051303.0rc1.el7ost.noarch

How reproducible:
100%

Steps to Reproduce:
1. Deploy OSP11
2. Upgrade to OSP12, major upgrade composable steps
3. Upgrade to OSP11 compute node

Actual results:
Compute node upgrade fails

Expected results:
Compute node upgrade succeeds

Additional info: