overcloud deployment failing with msg: 'argument parameters is of type <class ''str''> and we were unable to convert to dict: unable to evaluate string as dictionary'.

[Sandeep Yadav]

periodic-tripleo-ci-centos-8-ovb-3ctlr_1comp-featureset001-clients-master jobs are failing at overcloud deploy steps with msg: 'argument parameters is of type <class ''str''> and we were unable to convert to dict: unable to evaluate string as dictionary'.

ERROR Snippet
=============

https://logserver.rdoproject.org/openstack-component-common/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-ovb-3ctlr_1comp-featureset001-clients-master/e129acd/logs/undercloud/home/zuul/overcloud_deploy.log.txt.gz

~~~
2020-04-07 07:23:30 | TASK [Update parameters] *******************************************************
2020-04-07 07:23:30 | Tuesday 07 April 2020 07:23:30 +0000 (0:00:00.064) 0:00:00.283 *********
2020-04-07 07:23:32 | fatal: [localhost]: FAILED! => changed=false
2020-04-07 07:23:32 | msg: 'argument parameters is of type <class ''str''> and we were unable to convert to dict: unable to evaluate string as dictionary'
2020-04-07 07:23:32 |
2020-04-07 07:23:32 | NO MORE HOSTS LEFT *************************************************************
2020-04-07 07:23:32 |
2020-04-07 07:23:32 | PLAY RECAP *********************************************************************
2020-04-07 07:23:32 | localhost : ok=1 changed=0 unreachable=0 failed=1 skipped=1 rescued=0 ignored=0
2020-04-07 07:23:32 | Tuesday 07 April 2020 07:23:32 +0000 (0:00:02.022) 0:00:02.305 *********
2020-04-07 07:23:32 | ===============================================================================
2020-04-07 07:23:32 | Update parameters ------------------------------------------------------- 2.02s
2020-04-07 07:23:32 | Check for required inputs ----------------------------------------------- 0.07s
2020-04-07 07:23:32 | Set parameters fact ----------------------------------------------------- 0.06s
2020-04-07 07:23:33 | Ansible execution failed. playbook: /usr/share/ansible/tripleo-playbooks/cli-update-params.yaml, Run Status: failed, Return Code: 2
2020-04-07 07:23:33 | Exception occured while running the command
2020-04-07 07:23:33 | Traceback (most recent call last):
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/command.py", line 34, in run
2020-04-07 07:23:33 | super(Command, self).run(parsed_args)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/osc_lib/command/command.py", line 41, in run
2020-04-07 07:23:33 | return super(Command, self).run(parsed_args)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/cliff/command.py", line 187, in run
2020-04-07 07:23:33 | return_code = self.take_action(parsed_args) or 0
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 994, in take_action
2020-04-07 07:23:33 | self._deploy_tripleo_heat_templates_tmpdir(stack, parsed_args)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 382, in _deploy_tripleo_heat_templates_tmpdir
2020-04-07 07:23:33 | new_tht_root, tht_root)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 488, in _deploy_tripleo_heat_templates
2020-04-07 07:23:33 | deployment_options=deployment_options)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 507, in _try_overcloud_deploy_with_compat_yaml
2020-04-07 07:23:33 | deployment_options=deployment_options)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 221, in _heat_deploy
2020-04-07 07:23:33 | stack_name, env, moved_files, tht_root)
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 312, in _process_and_upload_environment
2020-04-07 07:23:33 | "parameters": params
2020-04-07 07:23:33 | File "/usr/lib/python3.6/site-packages/tripleoclient/utils.py", line 640, in run_ansible_playbook
2020-04-07 07:23:33 | raise RuntimeError(err_msg)
2020-04-07 07:23:33 | RuntimeError: Ansible execution failed. playbook: /usr/share/ansible/tripleo-playbooks/cli-update-params.yaml, Run Status: failed, Return Code: 2
2020-04-07 07:23:33 | Ansible execution failed. playbook: /usr/share/ansible/tripleo-playbooks/cli-update-params.yaml, Run Status: failed, Return Code: 2
2020-04-07 07:23:33 | + status_code=1
2020-04-07 07:23:33 | + openstack stack list
2020-04-07 07:23:33 | + grep -q overcloud
2020-04-07 07:23:36 | + echo 'overcloud deployment not started. Check the deploy configurations'
2020-04-07 07:23:36 | overcloud deployment not started. Check the deploy configurations
2020-04-07 07:23:36 | + exit 1
~~~

[Sandeep Yadav (sandeepyadav93)]

Fix Released:-
https://review.opendev.org/718759

This bug is duplicate of:-
https://bugs.launchpad.net/tripleo/+bug/1871338