Merge "Add a Kolla 'devstack' mode"

ansible/group_vars/all.yml

ansible/roles/destroy/defaults/main.yml

ansible/roles/destroy/tasks/cleanup_host.yml

ansible/roles/heat/defaults/main.yml

ansible/roles/heat/handlers/main.yml

ansible/roles/heat/tasks/clone.yml

ansible/roles/heat/tasks/deploy.yml

doc/index.rst

doc/kolla-for-openstack-development.rst

...tes/kolla-for-openstack-development-e4fa7991c8f4dc77.yaml

tools/cleanup-host

tools/kolla-ansible