Pull in downstream k8s installer changes

- Secretification of secret stuff
- Backup / restore

installer/roles/kubernetes/templates/secret.yml.j2

@@ -0,0 +1,13 @@
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  namespace: {{ kubernetes_namespace }}
+  name: "{{ kubernetes_deployment_name }}-secrets"
+type: Opaque
+data:
+  admin_password: "{{ admin_password | b64encode }}"
+  pg_password: "{{ pg_password | b64encode }}"
+  rabbitmq_password: "{{ rabbitmq_password | b64encode }}"
+  rabbitmq_erlang_cookie: "{{ rabbitmq_erlang_cookie | b64encode }}"
+  confd_contents: "{{ lookup('template', 'credentials.py.j2') | b64encode }}"