Comment 0 for bug 1960063

Brief Description
-----------------
Unable to add a subcloud with mixed docker_registries configuration such as:

docker_registries:
  k8s.gcr.io:
    url: myaws.private.com/k8s.gcr.io
    type: aws-ecr
    username: test_registry_user
    password: St8rlingX*
  gcr.io:
    url: myaws.private.registry.com/gcr.io
    type: aws-ecr
    username: test_registry_user
    password: St8rlingX*
  quay.io:
    url: quay.io
  docker.io:
    url: docker.io
  docker.elastic.co:
    url: myaws.private.registry.com/docker.elastic.co
    type: aws-ecr
    username: test_registry_user
    password: St8rlingX*
  ghcr.io:
    url: myaws.private.registry.com/ghcr.io
    type: aws-ecr
    username: test_registry_user
    password: St8rlingX*
  defaults:
    type: docker

Severity
--------
Critical

Steps to Reproduce
------------------
Add a subcloud with mixed docker_registries configuration (authenticated and unauthenticated registry sources)

Expected Behavior
------------------

Actual Behavior
----------------
Subcloud bootstrap fails with the following ansible error

TASK [bootstrap/persist-config : Create Barbican secret for elastic registry if credentials exist] ***
Thursday 03 February 2022 20:23:10 +0000 (0:00:00.015) 0:01:27.138 *****
fatal: [subcloud1]: FAILED! =>
  msg: |-
    The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'username'

    The error appears to have been in '/usr/share/ansible/stx-ansible/playbooks/roles/bootstrap/persist-config/tasks/main.yml': line 184, column 5, but may
    be elsewhere in the file depending on the exact syntax problem.

    The offending line appears to be:

    - block:
      - name: Create Barbican secret for elastic registry if credentials exist
        ^ here

PLAY RECAP *********************************************************************
subcloud1 : ok=177 changed=45 unreachable=0 failed=1

Reproducibility
---------------
100% reproducible

System Configuration
--------------------
Distributed Cloud

Branch/Pull Time/Commit
-----------------------
Feb. 02, 2002 master build

Last Pass
---------
This configuration has never been verified before

Timestamp/Logs
--------------
See error log above

Test Activity
-------------
Feature Testing

Workaround
----------
None