Merge "Automate setting up a cache tier"

ansible/group_vars/all.yml

ansible/roles/ceph/tasks/bootstrap_osds.yml

ansible/roles/ceph_pools.yml

ansible/roles/cinder/defaults/main.yml

ansible/roles/cinder/tasks/ceph.yml

ansible/roles/glance/defaults/main.yml

ansible/roles/glance/tasks/ceph.yml

ansible/roles/nova/defaults/main.yml

ansible/roles/nova/tasks/ceph.yml

docker/ceph/ceph-osd/extend_start.sh

etc/kolla/globals.yml