feature(grafana): Grafana uses url, user and password from configuration, check mon.yml for more details

Change-Id: I223e07e599f87ec07fe09c73dd68cd89aecc73bf
Signed-off-by: bravof <fbravo@whitestack.com>
(cherry picked from commit 396648b6eab42dcabdec1cef131618971dc64fbe)
diff --git a/docker/Dockerfile b/docker/Dockerfile
index b21e6e5..5032aad 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -54,6 +54,9 @@
 ENV OSMMON_COLLECTOR_INTERVAL 30
 ENV OSMMON_EVALUATOR_INTERVAL 30
 ENV OSMMON_PROMETHEUS_URL http://prometheus:9090
+ENV OSMMON_GRAFANA_URL http://grafana:3000
+ENV OSMMON_GRAFANA_USER admin
+ENV OSMMON_GRAFANA_PASSWORD admin
 
 EXPOSE 8000