Reparented ansible-collections-openstack-functional-devstack-{xena,\
wallaby,train}-ansible-2.{11,12} jobs from ansible-collections-\
openstack-functional-devstack-ansible-devel to corresponding ansible-\
collections-openstack-functional-devstack-ansible-2.{9,11,12} jobs
because the previous inheritance hierarchy had no benefits.

The new hierarchy has been straightened, i.e. redundant voting
overrides have been removed and jobs now properly inherit variables
such as tox_envlist and required projects such as github.com/ansible/\
ansible for the specified ansible releases.

Change-Id: I33addad110f4f15ec56dfea0fd18954c55d24b82
Signed-off-by: Kevin Carter <kecarter@redhat.com>
Signed-off-by: Jakob Meng <code@jakobmeng.de>