Allows users to explicitly specify which type of tenks
deployment they wish to create / destroy.
Preserves existing behaviour with defaults.
Modifies Zuul tests to use new tenks-deploy entrypoints.

Change-Id: I9aafed8481fd7564c0fc0abe5f6b21eceb824d75

This adds support for deploying a virtualised control plane via Tenks, using
the Kayobe development scripts tenks-deploy.sh and tenks-teardown.sh.

Change-Id: I752455af9eb44cdb0f9921fd0c876fc2dfb50a5c

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