updated pgstandby data directory that must be removed prior to standby setup.

installations/dc2/components/opdk-setup-postgres-standby.yml

diff --git a/installations/dc2/components/opdk-setup-postgres-standby.yml b/installations/dc2/components/opdk-setup-postgres-standby.yml
index a8dbba2..042a290 100644
--- a/installations/dc2/components/opdk-setup-postgres-standby.yml
+++ b/installations/dc2/components/opdk-setup-postgres-standby.yml
@@ -2,6 +2,7 @@
 - hosts: '{{ hosts }}'
   serial: 1
   roles:
+  - { role: apigee-opdk-setup-boostrap-rollback, remove_apigee: true }
   - apigee-opdk-setup-postgres-standby
   tags:
   - pgstandby