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/kubernetes/secrets/tasks/gen_certs_vault.yml

@@ -127,7 +127,7 @@
     issue_cert_path: "{{ item }}"
     issue_cert_role: front-proxy-client
     issue_cert_url: "{{ hostvars[groups.vault|first]['vault_leader_url'] }}"
-    issue_cert_mount_path: "{{ front_proxy_vault_mount_path }}"
+    issue_cert_mount_path: "{{ kube_vault_mount_path }}"
   with_items: "{{ kube_front_proxy_clients_certs_needed|d([]) }}"
   when: inventory_hostname in groups['kube-master']
   notify: set secret_changed