Make vagrant ask for ansible vault password

Vagrantfile

@@ -13,6 +13,7 @@ Vagrant.configure(2) do |config|
       ansible.verbose = "v"
       ansible.compatibility_mode = "2.0"
       ansible.playbook = "playbook.yml"
+      ansible.ask_vault_pass = true
       ansible.host_vars = {
         "datacoop" => {"ansible_python_interpreter" => "/usr/bin/python3.6"}
       }