Adding composers and customization files for ELK sample system and Metrics sample system (Prometheus & Grafana)

Change-Id: I2ba4ce27119051f210aa13a5a49f859c0b157d99
Signed-off-by: lavado <glavado@whitestack.com>
diff --git a/installers/docker/osm_elk/elasticsearch.yml b/installers/docker/osm_elk/elasticsearch.yml
new file mode 100644
index 0000000..ba67874
--- /dev/null
+++ b/installers/docker/osm_elk/elasticsearch.yml
@@ -0,0 +1,5 @@
+---
+network.host: 0.0.0.0
+cluster.name: "docker-cluster"
+discovery.type: single-node
+discovery.zen.minimum_master_nodes: 1