Comment 3 for bug 1773219

Reviewed: https://review.openstack.org/570484
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=3345557d7b64b29ccee258de8bcd6cfbfa88291e
Submitter: Zuul
Branch: master

commit 3345557d7b64b29ccee258de8bcd6cfbfa88291e
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