Comment 6 for bug 1885619

Reviewed: https://review.opendev.org/739497
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=39945d5630c0d83a8b7fafd6b45e945c3e89c800
Submitter: Zuul
Branch: stable/train

commit 39945d5630c0d83a8b7fafd6b45e945c3e89c800
Author: Alex Schultz <email address hidden>
Date: Mon Jun 29 12:50:43 2020 -0600

    Exclude /etc/hostname

    Similar to the previous patch where we excluded /etc/hosts, it turns out
    that /etc/hostname is also a special file that cannot be synced in via
    kolla because they are bindmounted internally.

    https://github.com/containers/libpod/blob/6ac009d5304127f6758be157c7302646e5a481e5/libpod/container_internal_linux.go#L1236

    Additionally this change includes cleanup for end users who may have hit
    LP#1860607 and allows folks who have hit this to just simply rerun the
    deployment and not have to manually cleanup the synced files.

    Change-Id: I84287d9c1ef110511c66743f9a3a22709077b0cb
    Closes-Bug: #1885619
    (cherry picked from commit 777920dfba58fa7b26c063fa5d6df0203009d12c)