Description of problem:
Running config-download playbook with --check (dry-run mode) fails
Topology - controller:3,compute:2,ceph:3

ansible log:
...
TASK [Stop iscsi.service] ******************************************************
fatal: [controller-0]: FAILED! => {"msg": "The conditional check 'iscsi_service_enabled_result.rc == 0' failed. The error was: error while evaluating conditional (iscsi_service_enabled_result.rc == 0): 'dict object' has no attribute 'rc'\n\nThe error appears to be in '/home/stack/config-download/Controller/host_prep_tasks.yaml': line 592, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  register: iscsi_service_enabled_result\n- name: Stop iscsi.service\n  ^ here\n"}
fatal: [controller-1]: FAILED! => {"msg": "The conditional check 'iscsi_service_enabled_result.rc == 0' failed. The error was: error while evaluating conditional (iscsi_service_enabled_result.rc == 0): 'dict object' has no attribute 'rc'\n\nThe error appears to be in '/home/stack/config-download/Controller/host_prep_tasks.yaml': line 592, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  register: iscsi_service_enabled_result\n- name: Stop iscsi.service\n  ^ here\n"}
fatal: [controller-2]: FAILED! => {"msg": "The conditional check 'iscsi_service_enabled_result.rc == 0' failed. The error was: error while evaluating conditional (iscsi_service_enabled_result.rc == 0): 'dict object' has no attribute 'rc'\n\nThe error appears to be in '/home/stack/config-download/Controller/host_prep_tasks.yaml': line 592, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  register: iscsi_service_enabled_result\n- name: Stop iscsi.service\n  ^ here\n"}

Version-Release number of selected component (if applicable):


How reproducible:

By running these steps:

source /home/stack/stackrc

openstack overcloud config download --name overcloud --config-dir /home/stack/config-download

tripleo-ansible-inventory --ansible_ssh_user heat-admin --static-yaml-inventory inventory.yaml

ansible-playbook --check --become -i /home/stack/inventory.yaml /home/stack/config-download/deploy_steps_playbook.yaml

Steps to Reproduce:
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Actual results:


Expected results:


Additional info: