orchestrate-devstack: Copy controller ceph.conf and keyrings to subnode

This change introduces a basic role to copy the contents of /etc/ceph
between the controller and subnodes during orchestrate-devstack allowing
a multinode ceph job to be introduced by
I9ffdff44a3ad42ebdf26ab72e24dfe3b12b1ef8b.

Note that this role is only used when devstack-plugin-ceph is enabled.

Change-Id: I324c0f35db34f8540ca164bf8c6e3dea67c5b1b4

roles/orchestrate-devstack/tasks/main.yaml

@@ -18,6 +18,11 @@
       name: sync-devstack-data
     when: devstack_services['tls-proxy']|default(false)
 
+  - name: Sync controller ceph.conf and key rings to subnode
+    include_role:
+      name: sync-controller-ceph-conf-and-keys
+    when: devstack_plugins is defined and 'devstack-plugin-ceph' in devstack_plugins
+
   - name: Run devstack on the sub-nodes
     include_role:
       name: run-devstack

roles/sync-controller-ceph-conf-and-keys/README.rst

@@ -0,0 +1,3 @@
+Sync ceph config and keys between controller and subnodes
+
+Simply copy the contents of /etc/ceph on the controller to subnodes.

roles/sync-controller-ceph-conf-and-keys/tasks/main.yaml

@@ -0,0 +1,15 @@
+- name: Ensure /etc/ceph exists on subnode
+  become: true
+  file:
+    path: /etc/ceph
+    state: directory
+
+- name: Copy /etc/ceph from controller to subnode
+  become: true
+  synchronize:
+    owner: yes
+    group: yes
+    perms: yes
+    src: /etc/ceph/
+    dest: /etc/ceph/
+  delegate_to: controller