Bump Grafana Docker image to 4.5.2

Change-Id: Iee95c3a7e35708418b0bd2cb3b406f2b1e4ee6d8
diff --git a/classes/cluster/sl-os-contrail/stacklight/server.yml b/classes/cluster/sl-os-contrail/stacklight/server.yml
index e22bd8e..1b71f88 100755
--- a/classes/cluster/sl-os-contrail/stacklight/server.yml
+++ b/classes/cluster/sl-os-contrail/stacklight/server.yml
@@ -50,7 +50,7 @@
     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:4.3.2
+    docker_image_grafana: grafana/grafana:4.5.2
     grafana_admin_password: admin
     grafana_database_type: mysql
     grafana_database_host: ${_param:cluster_vip_address}