Comment 4 for bug 2045139

Reviewed: https://review.opendev.org/c/starlingx/distcloud/+/903423
Committed: https://opendev.org/starlingx/distcloud/commit/153e2bac90cd94640eaa578c45b37d25ff09275f
Submitter: "Zuul (22348)"
Branch: master

commit 153e2bac90cd94640eaa578c45b37d25ff09275f
Author: Li Zhu <email address hidden>
Date: Mon Dec 11 18:52:57 2023 -0500

    Use keystone client cache in SubcloudInstall class

    A minor enhancement of previous commit:
    https://review.opendev.org/c/starlingx/distcloud/+/902140
    for supporting parallel subcloud installation.
    This enhancement aims to prevent the repeated creation of Keystone
    client and endpoint caches for each subcloud installation.

    Test plan:
      - PASS: Successful parallel subcloud installation without any keystone
              connection failured in a scale lab by executing the
              "dcmanager subcloud deploy install" command.
      - PASS: Successful parallel subcloud installation without any keystone
              connection failure in a scale lab by executing the
              "dcmanager subcloud add" command.

    Closes-Bug: 2045139

    Change-Id: I87cf4aca0c120d4c7c4bcc0e9162ea1372ac4c7d
    Signed-off-by: lzhu1 <email address hidden>