Don't base 'vagrant' on virtualization (prep for Proxmox)

Vagrantfile

@@ -27,7 +27,12 @@ Vagrant.configure(2) do |config|
     if provisioned?
       config.ssh.guest_port = PORT
       ansible.extra_vars = {
-        ansible_port: PORT
+        ansible_port: PORT,
+        from_vagrant: true
+      }
+    else
+      ansible.extra_vars = {
+        from_vagrant: true
       }
     end
   end

playbook.yml

@@ -6,7 +6,7 @@
   vars:
     ldap_dn: "dc=data,dc=coop"
 
-    vagrant: "{{ ansible_virtualization_role == 'guest' }}"
+    vagrant: "{{ from_vagrant is defined and from_vagrant }}"
     letsencrypt_enabled: "{{ not vagrant }}"
 
     base_domain: "{{ 'datacoop.devel' if vagrant else 'data.coop' }}"