Stack overcloud CREATE FAILED

Issue

• Overcloud deploy is failing, this can be seen in /var/log/messages on the controller:

Jun 27 05:52:13 overcloud-controller-0 os-collect-config: "keystone",
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: "$ docker exec --user=root keystone /usr/bin/bootstrap_host_exec keystone keystone-manage bootstrap",
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: "Either --bootstrap-password argument or OS_BOOTSTRAP_PASSWORD must be set.",
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: "Error running ['docker', 'exec', '--user=root', u'keystone', '/usr/bin/bootstrap_host_exec', 'keystone', 'keystone-manage', 'bootstrap']. [1]",
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: "stdout: Either --bootstrap-password argument or OS_BOOTSTRAP_PASSWORD must be set.",
...truncated...
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: to retry, use: --limit @/var/lib/heat-config/heat-config-ansible/dd3d4a41-ed29-492f-89e3-08a9fb6029c3_playbook.retry
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: PLAY RECAP *********************************************************************
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: localhost                  : ok=13   changed=8    unreachable=0    failed=1
Jun 27 05:52:13 overcloud-controller-0 os-collect-config: [2020-06-27 05:52:13,755] (heat-config) [ERROR] Error running /var/lib/heat-config/heat-config-ansible/dd3d4a41-ed29-492f-89e3-08a9fb6029c3_playbook.yaml. [2]