Merge "Performance: Parallelise Kolla Ansible host vars generation"

ansible/group_vars/all/kolla

ansible/kolla-ansible.yml

ansible/roles/kolla-ansible-host-vars/defaults/main.yml

ansible/roles/kolla-ansible-host-vars/tasks/main.yml

ansible/roles/kolla-ansible-host-vars/templates/host-vars.j2

ansible/roles/kolla-ansible-host-vars/tests/main.yml

ansible/roles/kolla-ansible-host-vars/tests/test.yml

ansible/roles/kolla-ansible/defaults/main.yml

ansible/roles/kolla-ansible/tasks/config.yml

ansible/roles/kolla-ansible/templates/host-vars.j2

ansible/roles/kolla-ansible/tests/test-defaults.yml

ansible/roles/kolla-ansible/tests/test-extras.yml

doc/source/configuration/reference/kolla-ansible.rst

etc/kayobe/kolla.yml