Switch to tripleo namespace grafana images

We cannot rely on quay app-sre namespace as they removed the
image and it blocked all the content provider job.

Switching to tripleo/grafana image for the same.

Closes-Bug: #1920873

Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com>
Change-Id: I6999e683edd82ef61fba768013b12408851f6f09
(cherry picked from commit e0b0d859ef)

container-images/container_image_prepare_defaults.yaml

@@ -42,6 +42,6 @@ parameter_defaults:
       ceph_node_exporter_image: node-exporter
       ceph_node_exporter_tag: v0.17.0
 
-      ceph_grafana_namespace: quay.io/app-sre
+      ceph_grafana_namespace: quay.io/tripleo
       ceph_grafana_image: grafana
       ceph_grafana_tag: 5.4.3

container-images/tripleo_containers.yaml

@@ -181,7 +181,7 @@ container_images:
   image_source: prom
 - imagename: quay.io/prometheus/node-exporter:v0.17.0
   image_source: prom
-- imagename: quay.io/app-sre/grafana:5.4.3
+- imagename: quay.io/tripleo/grafana:5.4.3
   image_source: grafana
 - imagename: quay.io/tripleoussuri/centos-binary-tempest:current-tripleo
   image_source: tripleo