Downstream k8s installer changes

installer/roles/kubernetes/templates/credentials.py.j2

@@ -7,6 +7,9 @@ DATABASES = {
         'PASSWORD': "{{ pg_password }}",
         'HOST': "{{ pg_hostname|default('postgresql') }}",
         'PORT': "{{ pg_port }}",
+        'OPTIONS': { 'sslmode': '{{ pg_sslmode|default("prefer") }}',
+                     'sslrootcert': '{{ ca_trust_bundle }}',
+        },
     }
 }
 BROKER_URL = 'amqp://{}:{}@{}:{}/{}'.format(