Move to rhel8 PG10 container for persistent PG

Merge in updated liveness checks from upstream template

installer/roles/kubernetes/tasks/restore.yml

@@ -95,7 +95,7 @@
       shell: |
         {{ kubectl_or_oc }} -n {{ kubernetes_namespace }} \
           exec -i ansible-tower-management -- bash -c "PGPASSWORD={{ pg_password | quote }} \
-            scl enable rh-postgresql10 -- psql \
+            psql \
             --host={{ pg_hostname | default('postgresql') }} \
             --port={{ pg_port | default('5432') }} \
             --username={{ pg_username }} \