Comment 3 for bug 1631158

Reviewed: https://review.openstack.org/384133
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-galera_server/commit/?id=1b0d2d3aa22564e21b7933d8ff21852c8f251ab4
Submitter: Jenkins
Branch: master

commit 1b0d2d3aa22564e21b7933d8ff21852c8f251ab4
Author: Jimmy McCrory <email address hidden>
Date: Sat Oct 8 09:48:40 2016 -0700

    Set default for physical_host if it's undefined

    physical_host is a host variable created by openstack-ansible's dynamic
    inventory. When using this role outside of an integrated OSA deployment
    it wouldn't be expected to be set. Fallback on using inventory_hostname
    when physical_host is undefined.

    Closes-Bug: 1631158
    Change-Id: I3364aac2e707d10ac9b4020dfcc0de7d4d158ff9