platform-integ-apps failed after moving app plugins to a different writable dir

[Bin Qian]

After host-lock/unlock, the application platform-integ-apps became apply-failed.

Severity
--------
Major

Steps to Reproduce
------------------
apply platform-integ-apps
host-lock/unlock
check application-list

TC-name: z_containers/test_custom_containers.py::test_host_operations_with_custom_kubectl_app

Expected Behavior
------------------
After host-unlock, platform-integ-apps become applied

Actual Behavior
----------------
After host-unlock, platform-integ-apps become apply-failed

Reproducibility
---------------
It is the first time to seen this issue.

System Configuration
--------------------
Two node system

[Bin Qian (bqian20)]

code review:
https://review.opendev.org/c/starlingx/config-files/+/840988
https://review.opendev.org/c/starlingx/tools/+/840989

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config-files/+/841144
Committed: https://opendev.org/starlingx/config-files/commit/8288417057e5683490331504dc8b2d72940e9590
Submitter: "Zuul (22348)"
Branch: master

commit 8288417057e5683490331504dc8b2d72940e9590
Author: Bin Qian <email address hidden>
Date: Mon May 9 12:04:30 2022 -0400

    Add python-siteconfig package to iso

    This change is to include newly added python-siteconfig package
    https://review.opendev.org/c/starlingx/config-files/+/840988
    to iso.

    Change-Id: Ica0eab0a7542af45f67eee317279969c04e9bf7b
    Closes-Bug: 1972019
    Signed-off-by: Bin Qian <email address hidden>