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/create_mounts.yml

@@ -1,14 +1,13 @@
 ---
 - include_tasks: ../shared/create_mount.yml
   vars:
-    create_mount_path: "{{ item.name }}"
+    create_mount_path: "/{{ item.name }}"
     create_mount_default_lease_ttl: "{{ item.default_lease_ttl }}"
     create_mount_max_lease_ttl: "{{ item.max_lease_ttl }}"
     create_mount_description: "{{ item.description }}"
     create_mount_cert_dir: "{{ item.cert_dir }}"
-    create_mount_config_ca_needed: item.name != vault_pki_mounts.kube.name and item.name != vault_pki_mounts.front_proxy.name
+    create_mount_config_ca_needed: item.name != vault_pki_mounts.kube.name
   with_items:
     - "{{ vault_pki_mounts.vault }}"
     - "{{ vault_pki_mounts.etcd }}"
     - "{{ vault_pki_mounts.kube }}"
-    - "{{ vault_pki_mounts.front_proxy }}"