Cleanup functional tests

Use the openstacksdk base functional test instead of going all
the way back to devstack for our base. Also - defining a job
starting with openstacksdk in this repo is not ok - but that
probably just came from the original copy-pasta coming from the
sdk repo.

Use tox-siblings more and stop doing tox requirements of ../
things. The system is there and we can use it.

Add jobs to test against released openstacksdk and ansible, as well
as a non-voting to test against ansible devel branch.

Add openstacksdk to the test-requirements because it's super
required.

Move zuul.yaml to .zuul.yaml. This isn't a zuul jobs repo so
we should just make it a hidden file rather than a non-hidden.

Change-Id: I658bd1728629cd358bc17a7f00d282d04530d8fe

tox.ini

@@ -56,12 +56,10 @@ ignore = W503,H4,E501,E402,H301
 show-source = True
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,ansible_collections
 
-[testenv:ansible-new]
+[testenv:ansible]
 # Need to pass some env vars for the Ansible playbooks
 passenv = HOME USER ANSIBLE_VAR_*
 deps =
     {[testenv]deps}
-    {toxinidir}/../openstacksdk
-    ansible
 commands =
     /bin/bash {toxinidir}/ci/run-ansible-tests-collection.sh -e {envdir} {posargs}