grafana: pull grafyaml in helper script

Make sure before running the grafana image is pulled so we get any
updates before trying to load the dashboards.

Change-Id: I01d1a2874cc96926ff60746af617e75c19f99b1b

grafana/run-grafana.sh

@@ -38,6 +38,9 @@ if [[ $(${DOCKER} ps -f "name=grafana-opendev_test" --format '{{.Names}}') \
     echo ". done"
 fi
 
+echo "Pulling grafyaml"
+${DOCKER} pull opendevorg/grafyaml
+
 echo "Reloading dashboards"
 
 ${DOCKER} run --rm --network=host \