The hawkular-cassandra and hawkular-metrics pod in ImagePullBackOff when openshift_image_tag=v3.11.784

Issue

• The hawkular-cassandra and hawkular-metrics pod is in ImagePullBackOff when metrics is installed/upgraded keeping openshift_image_tag=v3.11.784 in inventory file.

oc get pods 
NAME                            READY     STATUS             RESTARTS   AGE
hawkular-cassandra-1-hfhk9      0/1       ImagePullBackOff   0          8m
hawkular-metrics-kqk2q          0/1       ImagePullBackOff   0          8m
hawkular-metrics-schema-tb5z8   1/1       Running            0          8m
heapster-hl2dj                  0/1       Running            0          8m