Follows designate guide, adding a default zone for fixed and
floating IPs, then boots an instance and verifies that its
name resolves.
Change-Id: Ifbfdab425e2c8a36a8f3ab8539f70dca4cce2abc
Adds a new Zuul job, kolla-ansible-centos8-source-magnum, for testing
deployment of Magnum, Octavia and associated services.
Change-Id: I61b293ba6bb52064ea98a73e2dff0023fa01a2a2