Hostname resolution fails when deploying an Undercloud on OVH cloud

[Emilien Macchi]

ansible_fqdn and ansible_hostname are different on OVH cloud and it makes the undercloud deployment failing when we use an hostname for undercloud_admin_host:

http://logs.openstack.org/25/663425/7/check/tripleo-ci-centos-7-undercloud-containers/48ad45e/logs/undercloud/home/zuul/undercloud_install.log.txt.gz

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/665970

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/665970
Committed: https://git.openstack.org/cgit/openstack/tripleo-quickstart/commit/?id=9c740822b2a6beda2def1b1658ade92346988d07
Submitter: Zuul
Branch: master

commit 9c740822b2a6beda2def1b1658ade92346988d07
Author: Emilien Macchi <email address hidden>
Date: Tue Jun 18 08:38:47 2019 -0400

    fs027: use ansible_hostname for host resolution

    In I6425499e5d248e6cb2285f14dd9c6e716122b90b we used the
    ansible_hostname fact, not the FQDN. It worked because on most of the
    public clouds where TripleO CI is running, the fqdn is the hostname but
    it's not the case for OVH. Let's re-use the same fact to make sure the
    resolution works fine and the deployment can be done without error.

    Depends-On: https://review.opendev.org/#/c/666589/
    Change-Id: Ie85d841184a81f58e3dae748db93b233f770735b
    Closes-Bug: #1833233