refactor vault role (#2733)

* Move front-proxy-client certs back to kube mount

We want the same CA for all k8s certs

* Refactor vault to use a third party module

The module adds idempotency and reduces some of the repetitive
logic in the vault role

Requires ansible-modules-hashivault on ansible node and hvac
on the vault hosts themselves

Add upgrade test scenario
Remove bootstrap-os tags from tasks

* fix upgrade issues

* improve unseal logic

* specify ca and fix etcd check

* Fix initialization check

bump machine size

roles/bootstrap-os/tasks/bootstrap-ubuntu.yml

@@ -8,6 +8,7 @@
   changed_when: false
   with_items:
     - python
+    - python-apt
     - pip
     - dbus-daemon
   tags: