Exposing PM and ELK stack ports

Change-Id: I72476acb6edbec2be3a12a08cfa8c3ca2e35d346
Signed-off-by: Eduardo Sousa <esousa@whitestack.com>
diff --git a/installers/docker/osm_elk/docker-compose.yml b/installers/docker/osm_elk/docker-compose.yml
index c74eb67..9f03c4f 100644
--- a/installers/docker/osm_elk/docker-compose.yml
+++ b/installers/docker/osm_elk/docker-compose.yml
@@ -28,7 +28,7 @@
     volumes:
       - ./kibana.yml:/usr/share/kibana/config/kibana.yml:ro
     ports:
-      - "5601:5601"
+      - "${OSM_ELK_PORTS:-5601:5601}"
     networks:
       - elk
     depends_on: