Bump Grafana version to latest 5.1.3

Change-Id: I136c26278f514c43058e688df9774e5d75088cd9
Closes-Bug: PROD-20462
diff --git a/classes/cluster/sl-os-ovs/stacklight/server.yml b/classes/cluster/sl-os-ovs/stacklight/server.yml
index 071b036..a84b974 100644
--- a/classes/cluster/sl-os-ovs/stacklight/server.yml
+++ b/classes/cluster/sl-os-ovs/stacklight/server.yml
@@ -53,7 +53,7 @@
     docker_image_remote_collector: docker-prod-virtual.docker.mirantis.net/openstack-docker/heka:latest
     docker_image_remote_storage_adapter: docker-prod-virtual.docker.mirantis.net/openstack-docker/remote_storage_adapter:latest
     docker_image_prometheus_relay: docker-prod-virtual.docker.mirantis.net/openstack-docker/prometheus_relay:latest
-    docker_image_grafana: grafana/grafana:5.0.3
+    docker_image_grafana: grafana/grafana:5.1.3
     grafana_admin_password: admin
     grafana_database_type: mysql
     grafana_database_host: ${_param:cluster_vip_address}