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/cluster/binary.yml

@@ -3,7 +3,7 @@
 - name: cluster/binary | Copy vault binary from downloaddir
   copy:
     src: "{{ local_release_dir }}/vault/vault"
-    dest: "/usr/bin/vault"
+    dest: "{{ bin_dir }}/vault"
     remote_src: true
     mode: "0755"
     owner: vault