purge: remove /var/lib/ceph

This directory should be removed when the cluster is purged.
most of the services are started with the `--security-opt label=disable`
option. If the directory is not removed, it can cause SElinux issues
when the cluster is redeployed.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/purge-cluster.yml

@@ -1088,6 +1088,11 @@
           shell: rm -rf /var/lib/ceph/*  # noqa 302
           changed_when: false
 
+        - name: remove /var/lib/ceph
+          file:
+            path: /var/lib/ceph
+            state: absent
+
         # (todo): remove this when we are able to manage docker
         # service on atomic host.
         - name: remove docker data