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/vault/tasks/bootstrap/sync_etcd_certs.yml

@@ -3,7 +3,7 @@
 - include_tasks: ../shared/sync_file.yml
   vars:
     sync_file: "ca.pem"
-    sync_file_dir: "{{ vault_etcd_cert_dir }}"
+    sync_file_dir: "{{ etcd_cert_dir }}"
     sync_file_hosts: "{{ groups.etcd }}"
     sync_file_is_cert: true