tenks-deploy.sh deploys a minimal virtualized baremetal test cluster
locally. It also adds it to the overcloud-base CI job. To make the new
CI job work, we need to configure the firewall on the test machine to
allow the baremetal machines to communicate with the openstack services.

Change-Id: I7487a2606cf0bac71c5c63db41b2b518a6f6398b
Depends-On: https://review.openstack.org/#/c/615939
Depends-On: https://review.openstack.org/#/c/618003
Story: 2004297
Task: 27850

We use the demo script from kolla ansible, init-runonce, to create
resources in the control plane to make it ready for booting a VM. We
then create a nova server, and wait for it to become active. We do not
currently test that the VM boots successfully by accessing it via SSH.

Change-Id: I61be554366565decd9f4ff7805a3969aa37da4b9

Improves shell script quoting, and adds

set -u
set -o pipefail

The following top level scripts are added under dev/:

* overcloud-deploy.sh
* seed-deploy.sh
* seed-hypervisor-deploy.sh

Some amount of configuration is possible via dev/config.sh.