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/logstash.yml b/installers/docker/osm_elk/logstash.yml
new file mode 100644
index 0000000..91bcbb1
--- /dev/null
+++ b/installers/docker/osm_elk/logstash.yml
@@ -0,0 +1,3 @@
+---
+path.config: /usr/share/logstash/pipeline
+http.host: "0.0.0.0"