Description of problem:
OSP11 -> OSP12 upgrade: major-upgrade-composable-steps-docker fails with An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ImportError: cannot import name shlex_quote:

This is the failed upgrade tasks in the failures list output

overcloud.AllNodesDeploySteps.ControllerUpgrade_Step3.1:
  resource_type: OS::Heat::SoftwareDeployment
  physical_resource_id: 77bef0af-a037-46a5-9f8a-b8d69dc07d5c
  status: CREATE_FAILED
  status_reason: |
    Error: resources[1]: Deployment to server failed: deploy_status_code : Deployment exited with non-zero status code: 2
  deploy_stdout: |
    
    PLAY [localhost] ***************************************************************
    
    TASK [Gathering Facts] *********************************************************
    ok: [localhost]
    
    TASK [Check if httpd is deployed] **********************************************
    fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["systemctl", "is-enabled", "httpd"], "delta": "0:00:00.008017", "end": "2017-10-19 20:22:50.996250", "failed": true, "rc": 1, "start": "2017-10-19 20:22:50.988233", "stderr": "", "stderr_lines": [], "stdout": "disabled", "stdout_lines": ["disabled"]}
    ...ignoring
    
    TASK [Ensure mod_ssl package is installed] *************************************
    changed: [localhost]
    
    TASK [Check if cinder_api is deployed] *****************************************
    fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["systemctl", "is-enabled", "openstack-cinder-api"], "delta": "0:00:00.008898", "end": "2017-10-19 20:22:58.423753", "failed": true, "rc": 1, "start": "2017-10-19 20:22:58.414855", "stderr": "", "stderr_lines": [], "stdout": "disabled", "stdout_lines": ["disabled"]}
    ...ignoring
    
    TASK [Check if cinder_scheduler is deployed] ***********************************
    changed: [localhost]
    
    TASK [Check is heat_api is deployed] *******************************************
    fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["systemctl", "is-enabled", "openstack-heat-api"], "delta": "0:00:00.005772", "end": "2017-10-19 20:22:58.858121", "failed": true, "rc": 1, "start": "2017-10-19 20:22:58.852349", "stderr": "", "stderr_lines": [], "stdout": "disabled", "stdout_lines": ["disabled"]}
    ...ignoring
    
    TASK [Check if heat_api_cfn is deployed] ***************************************
    fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["systemctl", "is-enabled", "openstack-heat-api-cfn"], "delta": "0:00:00.005196", "end": "2017-10-19 20:22:59.053675", "failed": true, "rc": 1, "start": "2017-10-19 20:22:59.048479", "stderr": "", "stderr_lines": [], "stdout": "disabled", "stdout_lines": ["disabled"]}
    ...ignoring
    
    TASK [Check if heat_api_cloudwatch is deployed] ********************************
    fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["systemctl", "is-enabled", "openstack-heat-api-cloudwatch"], "delta": "0:00:00.005477", "end": "2017-10-19 20:22:59.257828", "failed": true, "rc": 1, "start": "2017-10-19 20:22:59.252351", "stderr": "", "stderr_lines": [], "stdout": "disabled", "stdout_lines": ["disabled"]}
    ...ignoring
    
    TASK [Check if neutron_server is deployed] *************************************
    changed: [localhost]
    
    TASK [get bootstrap nodeid] ****************************************************
    changed: [localhost]
    
    TASK [set is_bootstrap_node fact] **********************************************
    ok: [localhost]
    
    TASK [Stop pacemaker cluster] **************************************************
    changed: [localhost]
    
    TASK [Check for mongodb service] ***********************************************
    ok: [localhost]
    
    TASK [Install docker packages on upgrade if missing] ***************************
    changed: [localhost]
    
    TASK [Upgrade os-net-config] ***************************************************
    changed: [localhost]
    
    TASK [take new os-net-config parameters into account now] **********************
    changed: [localhost]
    
    TASK [Update all packages] *****************************************************
    changed: [localhost]
    
    TASK [blank ipv6 rule before activating ipv6 firewall.] ************************
    An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ImportError: cannot import name shlex_quote
    fatal: [localhost]: FAILED! => {"failed": true, "msg": "Unexpected failure during module execution.", "stdout": ""}
    	to retry, use: --limit @/var/lib/heat-config/heat-config-ansible/0161d598-50c6-442f-9eeb-64a1ba779abf_playbook.retry
    
    PLAY RECAP *********************************************************************
    localhost                  : ok=17   changed=14   unreachable=0    failed=1   
    
  deploy_stderr: |