Merge "Add support for deploying Zookeeper"

ansible/group_vars/all/kolla

ansible/kolla-openstack.yml

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

...ble/roles/kolla-ansible/templates/overcloud-components.j2

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

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

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

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

...es/kolla-openstack/molecule/default/tests/test_default.py

...s/kolla-openstack/molecule/enable-everything/molecule.yml

...penstack/molecule/enable-everything/tests/test_default.py

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

ansible/roles/kolla-openstack/templates/zookeeper.cfg.j2

ansible/roles/kolla-openstack/vars/main.yml