Comment 7 for bug 1882678

Reviewed: https://review.opendev.org/735215
Committed: https://git.openstack.org/cgit/starlingx/config/commit/?id=78974f643ab6bd65046385a774a3ee6f7313da15
Submitter: Zuul
Branch: master

commit 78974f643ab6bd65046385a774a3ee6f7313da15
Author: Andy Ning <email address hidden>
Date: Thu Jun 11 09:35:46 2020 -0400

    Run kubeadm command with specific configuration file

    sysinv uses the kubeadm command to generate kubeadm join command.
    However, it is not passing the --kubeconfig parameter to this command,
    so the command will search for the kubeconfig file. Normally it finds
    this file in /etc/kubernetes/admin.conf, but if a user accidentally
    (or intentionally) creates a config file at /root/.kube/config,
    this file can take precedence and cause the kubeadm command to fail.

    This commit updated the command with /etc/kubernetes/admin.conf as its
    configuration file explicitly.

    Change-Id: I4fb6d6325ca2cd8c7ab28c0acb0efdf6b1fea45b
    Closes-Bug: 1882678
    Signed-off-by: Andy Ning <email address hidden>