Add support for Ceph monitoring

This change adds support for Ceph monitoring:
- service.monitoring.cluster_stats is applied to monitoring nodes for
  collecting cluster-wide metrics (through the Ceph CLI).
- service.monitoring.node_stats is applied to the Ceph nodes for
  collecting monitor and OSD metrics (through Unix sockets).

Because Telegraf runs as a container on the monitoring nodes and
requires a working Ceph client configuration, this  change also adds
support for deploying Ceph client in container mode.

Change-Id: If7359aca34a350f2c8ee2251bbe8a85314550a45
diff --git a/metadata/service/client/container.yml b/metadata/service/client/container.yml
new file mode 100644
index 0000000..dfcd5a6
--- /dev/null
+++ b/metadata/service/client/container.yml
@@ -0,0 +1,8 @@
+applications:
+- ceph
+parameters:
+  ceph:
+    client:
+      enabled: true
+      container_mode: true
+      prefix_dir: ${_param:ceph_client_prefix_dir}