Use PROMETHEUS_CUSTOM_SCRAPE_TARGETS to pass sg_core scrape endpoint

https://review.opendev.org/c/openstack/devstack-plugin-prometheus/+/950476
adds the support for passing custom prometheus scrape target in d-p-p.

Let's use the same to pass sg_core endpoint.

Depends-On: https://review.opendev.org/c/openstack/devstack-plugin-prometheus/+/950476

Change-Id: I097d4875e75c097d9a7ea28ee57d3a6e4750194b
Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com>
diff --git a/.zuul.yaml b/.zuul.yaml
index 7cb45fc..f78e888 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -43,9 +43,7 @@
         CEILOMETER_PIPELINE_INTERVAL: 15
         CEILOMETER_ALARM_THRESHOLD: 6000000000
         AODH_DEPLOY: uwsgi
-        PROMETHEUS_CONF_DIR: /opt/stack
-        PROMETHEUS_CONFIG_FILE: /opt/stack/prometheus.yml
-        PROMETHEUS_CLIENT_CONF_DIR: /etc/openstack
+        PROMETHEUS_CUSTOM_SCRAPE_TARGETS: "localhost:3000"
       devstack_local_conf:
         test-config:
           $TEMPEST_CONFIG: