Comment 11 for bug 1773219

Reviewed: https://review.openstack.org/571714
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=14f082d8e0903fe98f1a280ddf32a7f4fca553e4
Submitter: Zuul
Branch: stable/pike

commit 14f082d8e0903fe98f1a280ddf32a7f4fca553e4
Author: Michele Baldessari <email address hidden>
Date: Fri May 25 01:56:32 2018 +0200

    Lowercase any hostname comparisons in bootstrap_* scripts

    If you deploy a stack with mixed-case hostnames things will break
    because no task that is supposed to run on boostrap nodes will run
    due to the following code:
    HOSTNAME=$(/bin/hostname -s)
    SERVICE_NODEID=$(/bin/hiera -c /etc/puppet/hiera.yaml
    "${SERVICE_NAME}_short_bootstrap_node_name")
    if [[ "$HOSTNAME" == "$SERVICE_NODEID" ]]; then
    ...

    The hiera key might contain mixed-case letters whereas the hostname
    won't and the end result is going to be that no bootstrap tasks
    will run on any nodes and, amongst other things, no database tables
    will be created, making all services unusable.

    Since we use bash explicitely we can leverage the ${var,,} expression
    for this.

    Change-Id: Ie240b8a4217827dd8ade82479a828817d63143ba
    Related-Bug: #1773219
    (cherry picked from commit 3345557d7b64b29ccee258de8bcd6cfbfa88291e)
    (cherry picked from commit 57dea6a3c77456b96d84d3e4f3d2881424194765)