Trident playbook is broken

[Mihnea Saracin]

Brief Description
-----------------
The Trident deploy doesn't work on stx master.

Severity
--------
Major

Steps to Reproduce
------------------
As documented in https://docs.starlingx.io/storage/kubernetes/configure-an-external-netapp-deployment-as-the-storage-backend.html , the folder "/home/sysadmin/mynetappconfig" was created and the file "localhost.yml" was put inside this folder. The command executed, as root, was 'ansible-playbook /usr/share/ansible/stx-ansible/playbooks/install_netapp_backend.yml -e "override_files_dir=</home/sysadmin/mynetappconfig/>" -vvvvv'.

Expected Behavior
------------------
The playbook runs successfully

Actual Behavior
----------------
Playbook fails

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

System Configuration
--------------------
AIO-SX

Branch/Pull Time/Commit
-----------------------
stx master build on 27/08/2021

Timestamp/Logs
--------------

The following error occurs:

TASK [common/load-images-information : Set kubernetes long version] ***********************************************************************************************************************************************
task path: /usr/share/ansible/stx-ansible/playbooks/roles/common/load-images-information/tasks/main.yml:11
fatal: [localhost]: FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: 'kubernetes_version' is undefined\n\nThe error appears to have been in '/usr/share/ansible/stx-ansible/playbooks/roles/common/load-images-information/tasks/main.yml': line 11, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Set kubernetes long version\n ^ here\n"
}

Test Activity
-------------
Developer Testing

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/ansible-playbooks/+/807112

[Ghada Khalil (gkhalil)]

screening: stx.6.0 / medium - failure on a specific storage config

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/ansible-playbooks/+/807112
Committed: https://opendev.org/starlingx/ansible-playbooks/commit/d4c5ca2aa05a3239d81f95a7cafff29fc1e22474
Submitter: "Zuul (22348)"
Branch: master

commit d4c5ca2aa05a3239d81f95a7cafff29fc1e22474
Author: Mihnea Saracin <email address hidden>
Date: Thu Sep 2 13:17:27 2021 +0300

    Fix Trident playbook

    The trident playbook was using a role which used an undefined
    variable named 'kubernetes_version'.
    We fix this by adding a role that will determine the
    'kubernetes_version' before using it.

    Testing done:

    Ran install_netapp_backend.yml playbook and it passed successfully

    Closes-Bug: #1942318
    Change-Id: Ie71b3b50a7667d2eaae7a002325b060d6130c26a
    Signed-off-by: Mihnea Saracin <email address hidden>