pep replicas set to two

site-pre.yaml

@@ -9,6 +9,7 @@
     pymail_password: "{{ smtp_pre_pwd }}"
     iam_host: https://accounts.pre.d4science.org
     pep: True
+    pep_replicas: 2
     pep_credentials: "{{ pre_pep_credentials }}"
     ha_network: True
     conductor_ui_secret: "{{ pre_conductor_ui_secret }}"