Source the exported vars before entrypoint exec

Change-Id: If40e943fee2ad928d8af64f61201800cc6f308de
Related-Bug: PROD-21141
diff --git a/prometheus/files/gainsight/gainsight_crontab.yml b/prometheus/files/gainsight/gainsight_crontab.yml
index b387053..89d961e 100644
--- a/prometheus/files/gainsight/gainsight_crontab.yml
+++ b/prometheus/files/gainsight/gainsight_crontab.yml
@@ -1,2 +1,2 @@
 {% from "prometheus/map.jinja" import gainsight with context %}
-{{ gainsight.crontab.duration }} root /opt/gainsight/entrypoint.py >> /var/log/cron.log 2>&1
+{{ gainsight.crontab.duration }} root . /opt/gainsight/vars && /opt/gainsight/entrypoint.py >> /var/log/cron.log 2>&1