Remove older references of Openshift != 4

Author: valmiranogueira

e2e-tests/custom-users-roles-sharded/compare/statefulset_some-name-cfg-4-oc.yml

@@ -172,6 +172,7 @@ spec:
             - mountPath: /opt/percona
               name: bin
       restartPolicy: Always
+      runtimeClassName: container-rc
       schedulerName: default-scheduler
       securityContext: {}
       serviceAccount: default