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_script.yml

@@ -12,7 +12,6 @@
     - k8s-secrets
     - kube-controller-manager
     - kube-apiserver
-    - bootstrap-os
     - apps
     - network
     - master
@@ -28,7 +27,6 @@
   when: gen_certs|default(false)
   tags:
     - k8s-secrets
-    - bootstrap-os
 
 - name: Gen_certs | write openssl config
   template: