Add support for Sensu integration with StackLight

This patch deployes Sensu as a cluster and adds a StackLight client.
diff --git a/sensu/client/stacklight.yml b/sensu/client/stacklight.yml
new file mode 100644
index 0000000..b41ee77
--- /dev/null
+++ b/sensu/client/stacklight.yml
@@ -0,0 +1,8 @@
+classes:
+- service.sensu.client
+parameters:
+  _param:
+    sensu_message_queue_host: ${_param:stacklight_monitor_address}
+  sensu:
+    client:
+      metric_handlers: []