Revert "datagrepper: switch proxies to point to ocp4"

This reverts commit 253b05aca3.

staging is failing, so lets not switch things in prod until we sort it
out.

playbooks/include/proxies-reverseproxy.yml

@@ -249,9 +249,9 @@
     remotepath: /datagrepper
     localpath: /datagrepper
     balancer_name: app-os
-    balancer_members: "{{ (env == 'staging')|ternary(ocp_nodes_stg, ocp_nodes) }}"
+    balancer_members: "{{ (env == 'staging')|ternary(openshift_nodes_stg, openshift_nodes) }}"
     targettype: openshift
-    ocp4: true
+    ocp4: false
     keephost: true
     tags:
     - datagrepper